Moog Prodigy Filter Scale problem-Help needed

[stevefuzz72]

Hello

I've almost finished the restoration of my Prodigy, S/N 10202
Replaced all the electrolytic caps and voltage regulators.

I went through all the calibration procedure without problems except the step called "Filter Scale, Emphasis and filter cutoff Frequency".
Unfortunately, carefully following the instructions, I'm not able to track the Emphasis oscillation to all the keyboard.

I've checked all the voltages around the filter ladder and they are all as indicated in the schematic with the exception at pins 3 and 13 of U15A where the expected voltages showed on the schematic are 8,3V and I actually have 4,9V on both pins.

Anyone could help me to solve the last issue on this Prodigy?