[old_coot88]

Just a coupla thots for when you tackle the beastie again.
You mentioned R127A running "pretty damn toasty". That's interesting since it shares the same current loop with hot-running R127B.

According to Sams there should be 117V DC on the low end of R127A, at its junction with R128A.
See simplified diagram attached.

What voltage do you get at the junction? Is it signifigantly lower than 117V?

Filter cap C5B connects from that junction to ground. Sams lists it as 80 mf.@350v.

Is there any chance that cap coulda been replaced with one having too low a voltage rating? If so, it could be breaking down and pulling excess current.

But if the 117 V is OK, then there isn't a problem.