Is there any way to repair or replate fingers like
this? Obviously,
tinning them with solder would prevent oxidization, but this would make
that 'finger' much too thick, and risks damaging the connector it plugs
into. (Operators loved to "fix" burnt edge connectors on arcade boards
like this, and it works for a while, until you go to unplug and replug it,
and the destoyed connector no longer mates with the board correctly.)
Use good quality solder and remove it with solder braid, it will look
like hot-air-leveling.