As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) IN CRUISE THE PORT BUS BAR WAS LOST, RCCB TRIPPED. THE TRANSFER OF NR 2 INVERTER LOADS WAS NOT ABLE TO BE ACCOMPLISHED. THE AIRCRAFT RETURNED. RCCB AND VOLTAGE REGULATOR REPLACED. TRANSFER POWER SOURCE RELOCATED TO THE CENTER BUS BAR IN ACCORDANCE WITH WIRING DIAGRAM FOR THIS AIRCRAFT.