Thanks for the replies.
The bike stays in the spare bedroom when not being ridden and like I said I've only used it 6 times in the 3 weeks that I've owned it.
It was a gift from my wife so I don't suspect her of molesting it.
I sometimes unclip by drawing my heel inwards toward the frame because of knee pain and it really was the only thing I could think of where the frame has even been touched.
Guess I'll strip the paint and have a look.
Thanks again,
Jan