I own an 07 and the exclamation sign came put twice so far, but that's the only light. No abs or vsc. Today i scanned it and the there was the c1377 stored. Most likely I'll have to replace the capacitor like u did. Hopefully yours the problem went away for good.
i notice alot of problems with these gen 2s are just the batteries and putting on new ones.....espesially the battery packs........ once you change those.......you can work from there and do a diagnostic on the prius .......im working on my prius lol