Have they gone microphonic? I’ve no experience with covered pickups but I have had to re-pot dodgy single coils a few times.
Quite possibly, they squeal when they're at high volume/gain... Very unpleasant...
Might be only slight then - if you tap them can you hear it through the amp? Wax-potting is pretty easy if you have a bit of time, or it’s also a good excuse to get new pickups!
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Have they gone microphonic? I’ve no experience with covered pickups but I have had to re-pot dodgy single coils a few times.