Quoted from crobby:
Behind the glass it looks like D709 is blown. I suspect that replacing that would bring things back to life temporarily...but I doubt that's the actual issue. Any tips on how I should sort out the real issue (I'm very much a noob at this)? Also, what's the type of fuse I'll be replacing.
You can download the Dialed In manual from jerseyjackpinball.com - Support - Downloads - Dialed In, it's close enough to help on some things until the Willy Wonka manual is out.
Page D-114, F709 is a 3A 250V 5mm X 20mm
Tips - look for anything obvious. Coil lugs close to metal, bare wires close to metal, squished wires. Start where you saw the sparks.
LTG : )