Fabia mk1 2003

I know this might have already been posted but Im new to the website and not sure how to use it yet and put a post in wrong forum already -.-! so i think this is right one but anyway here's my issue with my interior light.

The interior light was intermittent there is a aftermarket sunroof fitted (Topline) what started to leak and couldn't get a seal so sealed it shut and wanted to disconnect sunroof power so i took interior light out and checked and the sunroof was connected to interior light so i disconnected and now the interior light has stopped working all together!. Talking to electrician at work he seems to think its relay that's had too much current put through it and thats the problem but my problem is where is relay? and which relay is it that controls light? Fuse is also fine.

Please help.

Many thanks joe