Wanna reuse some old HDDs in the new PC as misc storage and I saw this on a really old drive (the PC it was pulled out of was built in I think 2008/9). Could the discoloration on E9 be because a capacitor leaked? The discoloration seems (from this side at least) to be fully contained on the circle and off of the rest of the PCB
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Not an expert here but the stain is limited to where the capacitor is located. I think it’s safe to assume the capacitor was faulty and to replace it.
Are there any capacitors on the other side because I don’t see any here. Quite likely just corrosion on exposed copper, should be harmless