Yes, I snagged another 8800A. I figured for $20 worst case I'd have some extra parts lying around - but the first goal is to try to resuscitate it. The unit is very clean inside and out - no cosmetic damage or broken pieces. It was listed as "not working" and indeed when plugged in, nothing happened. Line fuse was OK (checked it first) so likely nothing dead shorted in the PSU. Inside, nothing looked obviously damaged, though clearly someone had been in and replaced filter caps. I don't like the age of them, so they will be getting swapped anyway.
All the PSU voltages are very low, but the pre-regulator voltage levels are fine - so the caps are probably working for now, but I suspect U17/U18 may be toasted. I'm going to start running through the troubleshooting steps tomorrow since I have some free time.
But as I usually do, I'm taking a little time to check out possible replacement parts. There's nothing too crazy in this unit except for the two voltage reference devices. One is CR37, a MPD200 stabistor. Replacements for these seem to be very hard to locate, and even the recommended cross-reference devices don't show up in any of the usual places (best options seem to be a 1N4156 or CMXSTB200, essentially a high precision dual-diode). There's also U9, some kind of stable voltage reference, which is not listed except in a Fluke part number matched set.
It is shown in the schematic as an NPN transistor in series with a zener.
If anyone has a clue what might be readily available replacements for these, I'd be interested. Hopefully the problem is just one of the regulator or op amp chips, but since I have to order any or all of them regardless, I might as well get everything the first time, right?