The caps are SMT variety but since they are only two leads you can alternately heat the pads and rock the cap back and forth til it's free. Of all the SMT comps, they are some of the easier ones to replace but if you don't feel your soldering skills are up to it, then definitely seek assistance.
The cat piss smell is from the cooking electrolyte spill as it heats up with a soldering iron, but if it's been that way for a while as Magnus said, it's quite possible the cat piss electrolyte has eaten away at the copper traces on the board (just like real cat piss!), so again as Magnus said it may need additional trace repairs on the PCB under where the cap sits. There are also a couple of large electrolytic caps near the audio amp on the command board that cause a "thump" in the audio when the radio is turned on/off when they go bad so they should probably also be replaced too, while you're at it...
They must have gotten a bad batch of them for about a 6mo-1yr period, I haven't narrowed down exactly when it was, but it was toward the end of the analog Spectra production, so the problem is mostly confined to the later analog Spectras, but I have seen some "Spectra-E" and early Astro Spectras with the problem. The newer Astro Spectras and the Astro Spectra Plus'es don't seem to have the problem that I have seen, nor do the really old analog Spectras.