Thank you muchly, the both of you.
As for the error code, it seems to be flashing three times, but I'm stumped, because there doesn't appear to be a notification for three flashes--just two or four. I guess it'd be closer to four, which according to the first site provided, indicates vertical failure. From the site:
"Standby light blinks 4 times, pauses, and repeats--set turns off. Vertical failure (the horizontal could also cause this since the power for the vertical comes from the flyback)
I am REALLY hoping I don't have a bad flyback, as that tends to be the most expensive part, and the hardest to find. I'm now to the point where I'm pretty confident that I can replace a HOT by myself, as long as I can find an exact replacement
EDIT: I got an error code trying to download the schematic from the givemefile.net site. Hopefully it'll sort itself out soon