Good call on using an oscilloscope! Most of my DC voltages were initially looking pretty clean. I got to that one voltage I had mentioned was a bit higher than specification and it had a little bit of variance to it compared to the others.
+VU (Pins 16 & 10)
Then I got to the voltage for the display (Vbb), which is supposed to be between 45-55V DC. A multimeter confirmed this, however looking at it through the scope showed a sawtooth wave. (I had the channel on AC mode so this is a variance of around 0.275 Volts)
Vbb (Pins 25 & 23)
But perhaps the worst one (if the service manual is correct), is between pins 27 – 23 for ‘Display Offset’. It’s supposed to be between 8-11V DC, however measuring it on the scope showed a full on sin wave. The measurement listed prior to it (‘Filament’) in the manual is an AC signal and measures as such.
Display Offset (Pins 27 & 23)
So yeah, definitely looks like a recapping is called for. Will have to get those ordered and replaced.