Rebuilding elgar 6000b conditioner?

^^ Yes, there aren't that many electrolytics.
BTW, if you had one of these that was unstable and blew fuses in your amps or something like that, the problem is calibration. The unit has an adjustment that 'tunes' it to 60Hz; if that is off the unit will react poorly to loads at its output. Once its locked in a 60Hz its imperturbable.

Replace the main filter caps. There are also some electrolytics on the circuit boards that should be replaced.

Its also a good idea to remove the power transistors and reseat them with fresh heatsink compound.  We've also found it to be a good idea to replace the power cord.

Calibration is not a bad idea. But you'll need test equipment for that- DO NOT try to adjust any of the trimmer potentiometers on the circuit boards without test instruments and the calibration procedure.