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Chances are if one or more caps are mushroomed on top(not flat), then the caps need to be replaced and reversed, but not just the 2 that are bad, but all the Aux inputs and the 2 mains. It will save you time not having to take it apart a second or 3rd time.

Note, it's just those, not all on the board

Post#18 has a pretty good explanation with pictures.T

Here is what a good one looks like with caps in the proper direction.