So your red secondary is a bit high, it may be due to the higher input voltage.

The green is a tad high, so that points to the same as the red. That is what powers the power lamp and the filament/heaters for the 12ax7s. Just double-checking, did you use the artificial center tap?

The yellow is the most concerning. I would do some digging there. That is what powers the rectifier tube. It should be 5 VAC going into pins 2 and 8 on the rectifier. The DC voltage is the rectified voltage post 5Y3. So it seems you have both a 427 VDC and 435 VDC readings there at different times?