[BScout]

Put it in Vegas mode to check faders, knobs, lcds, leds. And then carefully scan every part while they are in motion/blinking.

As for power supplies, at the age they all are, they will need to be replaced. If they’ve been replaced in the last 5 years, you’ll be good for a while. If they haven’t, expect to. Not an expensive replacement. The fader and led power supplies are the ones that need replacing as maintenance. The control power supply rarely needs replacing (found only in the main unit.) (Main unit has 3 power supplies, add on fader packs have 2 power supplies. So a 24 fader d-command has 5 power supplies total)