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It's most likely an E74 which is a problem with the GPU (rarely) the (H)ANA chip or a connection somewhere in between. There are fixes out there for it, but don't always work - google it. Team HYBRID has a fix tutorial for it somewhere... unsure of the link at the moment.

How should I go about cleaning them? I do not want to bend the wee little pins out of shape, but need to get the crusty stuff off. Any ideas for a solvent that would work well?

In my experience thermal paste remover/purifier also works well to clean corrosion. On PCB I just put a drop or two of ...