As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) DURING MAINT INSPECTION, NR 1 SPU BREAKER TRIPPED AND WAS IMMEDIATELY RESET. SHORTLY AFTER, THE R TRU AND R AC BUS CAUTION LIGHTS CAME ON. NR 2 AC GENERATOR WAS RESET AND THE CAUTION LIGHTS WENT OUT, HOWEVER, 3-5 SECS LATER CAME BACK ON BLINKING AND RT AC VOLTS INDICATED 25-75. CAUTION LIGHTS REMAINED ON STEADY AND AC VOLTS WERE ZERO. INVESTIGATION REVEALED THAT RCCB IN AC CONTACTOR BOX HAD A HOLE BURNT IN THE BOTTOM AND ADJACENT WIRING WAS DAMAGED AS WELL.