Rienza leaking

We have been in Norfolk for the last tree nights during the heavy rain. Last night we noticed the tops of the rear seat cushions were wet in a couple of places.Also there was rain dripping from the habitation lock handle inside.
The door lock looks like its  the gasket on the outside. It is sticking out and split. The rear window leaked in the same place when we got the Rienza so we took the window out and re-sealed it.
Before we take the window back out I noticed  the high level brake light is above the window. Maybe we should try re-sealing that first. I cant see any mounting screws. Any clues as to how it is fastened in place.

 I have had a look at the brake light this morning. It appears to be held in place by four blobs of sealant of some sort. I think there were some sort of mountings  that it clipped in to when new. Behind this is a small hole for the wires to go into the body work.
I cant see the leak we had being from this area so it looks like the window is coming out again before we go to Scotland. I am tempted to use Sikaflex this time. It might seal it but it would be a very difficult job to remove the window again should we need to. I have fitted bus windows with Sikafex and it is a pain getting the old stuff off again. 
I have some mastic tape left from last time so I will try that again. Maybe it will last more than three years this time. 

I thought Autosleepers built motorhomes quite well compared to some manufacturers.   As I said the high level brake light was adrift at one corner so before the window comes out I climbed up there today to suss out the problem.
The back of the brake light has four threaded bosses to secure it with screws through from the inside. This would mean having to take the top lockers out to remove the light. Autosleepers must have thought about that problem so they fitted the light with four blobs of silicone and threaded the wires through a hole behind the light. 
This was ok fourteen years ago when the Rienza was built but now the silicone has lost its grip. I have removed the old silicone and re-fitted the light with new Sikaflex blobs and sealed the hole around the cable. I will worry about getting it off as and when I need to but for now that should be one less potential leak.
To make life a bit easier when I take the window out I have started by taking the top corner screws out. I can get at them from the corner lockers with the minimal amount of pain. Some of my joints dont like contortions any more. The rest of the screws will come out via the Dewalt but back in by hand. Management has three days off this weekend so I have a bit of help between preparing for our trip north of the border. 

I re-sealed the rear window today. Not too bad a job with my son helping, he is a foot taller than management so lifting the window in and out wasn't as bad as last time.
The leak must have been from the brake light because the mastic around the window frame was intact and still very sticky. It took a lot of carefull tugging to get the frame out. Had I used Sycaflex I don't think we would have got the window out with it being recessed in t!he rear pannel there isn't a lot of room to get leverage.
A good thing from this is the wood around the window is dry and no signs of rot. The water from the leak ran down the inside onto the cushions rather than into the frame.
A slight moment of silly tricks when we checked the blind and fly screen. The fly screen wouldn't go back up. After a lot of swearing we decide to slacken the frame screws. Moving the curtain to get at the side screws we realised the curtain was trapped under the frame jamming the fly screen. All sorted now with only minor joint pains.
Management volunteered her help at the end so she maned the Dyson. Apart from food shopping and clothes we are ready to head north next Saterday.

Thanks Peter, Hopefully we won't have another three days of solid rain as in our last trip to Norfolk. We were not the only ones with leaks. The tents on site were sodden by day two, most gave up and went home. The Motorhomes stayed put retreating into the pubs or cafes.
Maybe Scotish rain wil be more forgiving. If not there are plenty of distillerys to visit.