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There's usually a small square thermal pad that sits under the power supply and makes contact with the DC-DC IC. I've seen them go "off" and leave a residue on the PCB and components. If the power supply has been out a few times someone probably already removed it.
For SMD electrolytic caps I usually twist the body of the cap off with pliers, then heat the pads with the iron to remove the leads. Most of the time I just replace them with ordinary non-SMD caps. For the others I heat both ends and nudge them off.
They can visibly bulge or leak, but usually not. You need an ESR meter to test them.
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