Done. This one was easy.
Verified and back on duty.
Nice!
The spaceship is counting again!
I also did some recapping on my blue-faced HP 3456A voltmeter today because it was not happy and threw an error 4 when in self-testing.
I checked the voltage rails and 33V was an AC voltage with 5V DC offset.
Having discovered that I looked at the voltage rails with my analogue scope and discovered rail -18V had a ripple on it.
I had to swap two caps that were completely dead (some pF left of 470/100µF) and a third one that still had its capacity but a high ESR failure:
All other caps measured well within spec and with small ESR values <<1ohm.
Now it seems like this repaired unit has less noise than the two other I measured the noise comparing different integration times.
Well, I think I have to check those two other units as well now..