Hi - does anyone have any advice please. I have some damp, poss old leak at outside corner of my shower, near base of sink. Some small areas of wooden shower surround seem a bit spongey and have black mould in the little round screw fixings. I don't know if I need to replace the whole wooden shower door surround or even if I can - it's a Lunar Venus 500/4 . I'll add some pics to the thread if I can - many thanks