I'd think so too (even though this doesn't preclude something else being shot, too). I just measured across pins 2&3 and 1&2: it's 0 ohms (both combinations) for one of the two MOSFETs (i.e. 0 ohms across any two of the three pins) and 0 ohms and 15.6 ohms for the other. I think they're clearly shot. Now I just need to be lucky and they're the only thing that's fried and are not just being fried because of some other problem!
Wish me luck! I so miss my bass!