Paul, did you mean C or A? (because I was getting 2.36 v out of the C's when I checked them previously...it was the A's with zero)
But that aside, You are talking about the connection from the power transformer terminals 12/red to C4 and 13/black to C1, correct? If so, I have continuity from past both terminals on the power transformer (I'm touching the little "solder nubile" that sticks out on each terminal on both sides of the transformer) to also past the C1 and C4 terminals on the C socket. In other words, I'm not touching any part of the actual wire, so to me that confirms a good solder since continuity is achieved outside of the wire or the solder itself.
Now, on the other hand, I also checked the same on the A socket.....and while the black wire has continuity past both ends of the wire, the Red wire does not. I have continuity from the A1 socket terminal and all around that solder itself, but The red is dead on the terminal 11 on the power transformer side....I do not have continuity there.
So that being the case, should I simply try to resolder that connection on 11 on the power transformer?
Esoteric DV-50, Technics SL1200-M3D, B&K Phono 10 Preamp, Sumiko Blue Point Special Evo III, Bottlehead Stereomour, Orca's