Hey Mark…. Did you ever figure this out? I’ve got the exact same issue going on with deluxe reverb reissue. Except on the rectifier I’m getting more like 7v on P2 and like 1v on P8. And my DC on P8 is even higher than yours.
I’m wanting to think that it’s an issue with xfmr yellow wires but I don’t understand how it can raise the DC voltage so much. Wanting to feel more confident the yellow wire voltage is the culprit b4 I drop the $ on a PT.