Belles 21A preamp upgrades?

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Audio Monkey

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Joined 2020
On a Belles 21A preamp, I have to remove the motherboard to replace a bad selector switch relay.

Everything else works well, and it sounds fine, but it is 17 years old. As long as I am in there, should I consider any upgrades? I am thinking along the lines of the large yellow Amphion 2.2 uF coupling capacitors.
 

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