AVS Special Member
Join Date: Mar 2008
Location: Australia; now run by adults.
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If it's working fine, leave it alone. If it plays up, then do what Giz suggested. Course black (sandpapery feeling) erasers work well at brightening up pins, as do scrotchbrite pads.
I'm not a fan of removing/replacing tubes more than is necessary as sockets loosen with repeated use, and most people remove the tubes incorrectly which can affect the integrity of the seal between the pins and the envelope. Flexing PCBs during insertion/extraction can lead to cracking if they are not supported correctly.