Holy crap! Thanks a ton! I somehow didn't get updated on this thread. @brandy & @PA0PBZ, you guys are the best!
Since initial teardown, I toothbrush cleaned the main PCB and front panel with IPA and tested the unit. The 40khz ultrasonic I had at the time would have damaged some mems parts and oscillators, so I opted for the tooth brush method. It did not do that great of a job but I was able to get the scope to boot and control it over ethernet, which is kind of nuts. The waveform generator only showed a white screen when I got it.
Later on, I grabbed a 132kHz ultrasonic and cleaned the front panel. It came out spotless and the waveform gen is actually responsive, the LCD works and the front button panel works, but unfortunately I damaged component U704 while blowing the alcohol off the board from ultrasonically cleaning. I should have regulated the air output.
U704 is deceiving and looks like a big ol SMT inductor, especially with the large pads on either side, but I should have known better since it's U### not L### component silkscreen. The lid blew off and what looks to be an oscillating bit of crystal on a thin metal sheet popped out. I may be able to solder it back together but I highly doubt it'll ever work right again. :'(
Does anyone know what oscillator company makes part U704? The logo looks similar to the micron logo, but micron does not make oscillators. I'm going to try and hunt the part down.
I circled the part in red. Thanks tremendously!