Avon FRB 380, bubbles under wear strip

[entropy]

I noticed these air bubbles under the wear strip on my Avon FRB380. I assume there is a small leak underneath. No bubbles on top when doing the soapy water test. Has anyone ever seen something similar? I'm curious how I could get a sub-surface leak like this. The hypalon is in perfect condition elsewhere on the boat, no cracks or porosity.

I suppose I'll have to get out the heat gun and lift the wear strip and see what is going on underneath.

[cgoing]

Seen it plenty of times. In some cases there was no actual leak underneathe just a bond that failed. Have also seen a couple with very small leaks underneathe. Had one that was worn through from the inside of the tube from the valve rubbing while folded over many many years.