OP
Darkwood
To note here you say its less than 6months old if it is found to be the fault of another trade and through no installation issues with the electrics then they may be liable to all costs but you should notify them before doing the works .... but if the customer isnt aware of this it sometimes isnt worth all the hassle that comes with going down this avenue .....tell her to get her spare wallpaper roll out and chop the bugger out