If the rest of y'all are getting bored, we can take this thread private.
Please keep this on the forum, Henry & Heinz.? This whodunnit story is becoming curiouser & and curiouser.
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My $0.02 is simply that if it is the capsule, it will be VERY noisy long before it stops working.? Of course you could be right that capsule leakage is mucking up the biasing of the amp.
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The fact that cleaning the PCB solved the problem, at least temporarily, suggests it is muck on the PCB.? If there are no EVIL polystyrenes, it might be worth doing this again; perhaps in an ultrasonic bath.
