We definitely had a leak behind our shower( Probably for at least three months) and Plumber fixed that and today we had the local Servpro in becuase I could still smell the musty odor and they said there was no evidence of mold and the drywall under the leak looked fine- There is no leak stain on the kitchen ceiling below and yet the smell continues.

Any suggestions before I rip out my newly painted kitchen ceiling to see if I can find the smell. I don't know what to do if the experts are not finding any cause.