Metal Slug X with sound issues

I have two Metal Slug X carts with distorted sound. The boards look legit, I’ve cleaned the edge connectors and checked the soldering points of the sound chips (as well as I could) but I can’t find anything wrong.

Any ideas about what might be wrong and if it’s fixable would be much appreciated.

Pictures of the boards from one of the carts with distorted sound.

Metal Slug X - board 1 front
Metal Slug X – board 1 front
Metal Slug X - board 1 back
Metal Slug X – board 1 back
Metal Slug X - board 2 front
Metal Slug X – board 2 front
Metal Slug X - board 2 back
Metal Slug X – board 2 back

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