PMC transmission started going down this afternoon, around 3pm-ish. Right now it's 0.775, which is very, very low. The new MC locking stuff is engaged, so it's not the FSS slow servo's fault.
EDIT: I just realized that the limit of 0 counts output of the MC2 MCL filter bank was still engaged, from a time earlier this afternoon when I had switched back to the old servo, so there was no feedback going back to keep the slow drift of the laser in check. PMC trans isn't coming back instantly, so I'll check it again when I come in tomorrow.