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withered_preacher
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I'd just do it by eye. You might see something is obviously loose or feels loose.
Also, if it wasnt doing it before repair, and is now. Then it's something to do with the repair (simplest answer) so check that. The amp is grounded inside, so take the case off (with power unplugged) and check in there too.
If non of those fix it, then needs more investigation.
skinny
Yes. And sort it out before it causes an issue.
If the speakers are all good, check the grounding.