Difficult to tell without a picture, but I'll confirm there are no marks on my bike's instruments.
I were thinking possibly water ingress, but my bike lives outside, and gets used all year round.
I'll agree it won't be cheap, might be some in breakers yards (I think the later thou's used the same clocks), maybe a friendly TV engineer or similar is worth a bell?
I've heard of Ducati clocks suffering with water and failing - but not the Fazer.