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The bottom-left one in the second photo has a very dry joint, probably from corrosion.
I had one cap in a similar state on an A1200 and it was quite difficult to remove. It took several attempts with flux and new (leaded) solder before the joint reflowed enough to remove the cap. I was using two soldering irons set to 650F but was still really cautious about keeping heat on the pad too long. I have little faith in the glue holding pads to a 25 year old board.
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