Nuevo EK reversing camera

My 2014 Nuevo reversing camera has packed up, all I get is the blue screen and "no signal".
Camera is either glued to the outside or bolted from the inside and have no idea which way the wires run.
Any clues gratefully received.

I think that there may be some differences in the cameras used but on our 2016 Broadway the camera was only accessible by cutting into the back of the cupboard above the sink or by taking the cupboard back panel out all together. After having a replacement camera and two new video units under warranty it was decided that there was a wiring fault but this is not accessible so the fitter ran new cable under the van.

Thank you.  
I think your installation sounds just like the Nuevo's.
It doesn't sound like a reasonable DIY job.
Perhaps somebody else will tell me different !
I'll ask my Nuevo supplier if he has repaired any others and see if he'll tell me.