Ask for some delivered Chinese Food.
Throw it away (or plain eat it ... with a fork) but keep the (clean) chopsticks.
Use one of these to softly whack *every* part, wire, switch, board in your amp, you'll soon find which is the sensitive/microphonic part.
Or you might just have an over sensitive reverb tank.
Remember they must "float", a common error is to overtighten its screws and fix it solidly to the cabinet.