Replacing capacitors mounted on a board are a bit tricky and best left to someone with experience. Point to point circuits are fairly straightforward. Don't ask me how I know.
DACs and bass response?
I'm auditioning dacs in my system. One (COS) was way to analytical, overall, but had very tight bass. Another (Aqua La Voce) is what some would describe as "musical" and sounds terrific in all aspects except bass. My cdp alone does better in that regard. I have monitors and no subs. Can I expect that dacs that are hyper-detailed will also offer tighter bass as a rule?