As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE AT CRUISE ALT 32000 WITH 28 MIN INTO THE FLIGHT, ACFT FAIL LIGHT CAME ON WITH MASTER WARNING. ACFT FAIL LIGHT STAYED ON UNTIL WE RESET MASTER WARNING AFTER 5 MIN. DURING THIS TIME VOLTS SHOWED 28 AND GENS SHOW 50 AMPS EACH AND WERE STEADY. INVERTERS SHOWED GOOD. M2B- FOUND CONNECTOR PN 383 OF NOSE AVIONICS J-BOX WITH BROKEN THUMBSCREEN CAUSING LOOSE CONNECTION REPLACED THUMBSCREEN WITH NEW, OPS CHECK NORMAL IAW MM 20-21-03 AND 560 WDM 24-20-01