As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING ACFT POWER UP PROCEDURE WITH STAND BY BUS ON. IMMEDIATELY AFTER SELECTION OF BATTERY 1 LOWER MFD SCREEN EXTINGUISHED, NO CURSOR CONTROL. ONLY SERVICEABLE ITEMS: COMM 2 AND NAV 2 IN CONJUNCTION WITH SCREEN, EXTINGUISHING A SOUND OF A JUNCTION BOX INTERRUPT. UPON TROUBLESHOOTING WAS ABLE TO ISOLATE THAT AV1 CONTACTOR WAS NOT LATCHING.