Large Scale Central

Accucraft Goose No7 lighting problems

I have just received a Goose No7 to add to my 'gaggle' of 1,2 and 6.
 
It was brand new or, should I say, it had not been opened since new. She is in perfect condition and works very well except that one of the front lights is very very dim and the rear one does not work at all.
 
As the item will now be well out of warranty, I was wondering if anyone else has had problems like this.
I will open her up to trace the wiring in case the problem lies there. 
I have already tried to open the afflicted headlight to access the bulb but it does not seem to want to open. Same for the rear one. Is there a way of opening the light?

Front light, lens is glued in. Cut it loose with exacto, carefully. Rear not sure, mine is packed away at the moment, don’t recall that it was wired at all. Wiring is simple, easy to trace.

John