1994 Topaz leisure Battery Charger

Does anyone know where the leisure battery charger unit is located on a 1994 VW Autosleeper Topaz.
When we bought the Topaz 12 months ago the Leisure battery charger was working fine, but now it has stopped working.
I have checked the green power light on the Zig controller and there's no power going to it.
If I feed power to the bulb it lights up so its not the bulb.
I have looked under all the seats, in all the cupboards and everywhere I can think of including behind the panel between the toilet and the sink
but cant find it.
We are members of the Autosleeper Owners Club and I contacted the tech guy unfortunately he doesn't know where it is. 
And he suggested someone on the forum might know were it's located.

Mick54

I've just answered your question in the welcome section.

Thanks for the info Paul.
Do you know if I have to remove the whole cupboard to get at the charger
or is there some way of removing the false back wall?

The back wall or floor should be removable on their own.