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Transformer mechanical noise

isn't fixed by bypass caps. Its more likely that the screws that hold the end shells to the laminations were loose. That can happen over 20 years and can cause the transformer to rattle.

You don't need to solder to remove the pesky bypass caps around the main coupling caps. A set of diagonal cutters will do the job nicely. But if you're not comfortable knowing your way around the insides of the amp I'd take it to someone who does!

You'll hear no loss of highs, but you may notice it seems smoother.

Were the power supply filter caps replaced when you had this work done? The amp is old enough that would be a good idea. The 'half life' of the filter caps in tube amps ('half life' meaning about half of them are ready to fail) is about 20 years (due to heat).

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