Undoing four screws on the sides of the scope let me slide the top cover off to reveal the innards.
The top circuit board looks to be the power supply board, and probably a few other things. Undoing a bunch of screws holding the top board down and a bit of fiddling around (discovered the board is on a hinge) let me lift it up to reveal more of the scope’s innards.
Three screws hold the cover of the power supply section.
A few dust bunnies inside, but overall everything looked to be in fairly decent condition (aside from not working).
First look around the inside didn’t reveal anything obviously wrong. No blown caps or scorched areas. Whether this is something I’ll be able to repair or not is still up in the air. This scope is probably going to be spending a while on the bench.