usually its just the one cap on the +15 volt standby supply which is on the daughter card.
No green LED when plugged in which I think that document goes through.
the standby supply is obviously on whenever the unit is plugged in so more prone to the capacitors aging.
Usually do not do the 8924 main board caps unless they failed.
8920a/b 8921's have the main caps fail more often on the low voltage outputs
