You don't have fuses in F7-F9? Those do need fuses. The inside cover of the manual doesn't list them. But they are mentioned with the proper fuse on I think page 65 of the PPB board schematics.
Quoted from blondetall:You should get a "COIN DOOR OPEN" and something like "high voltage disabled" message on the DMD when you first open the door
I'm not sure mine does anything different with the door closed or open. The only time it's ever indicated that the door was open was when I installed the NVram. And all coils and flashers have worked with the door open when going through diagnostics.