As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON START UP, THE CREW HEARD ARCHING SOUNDS ON R/H CIRCUIT PANEL FOLLOWED BY A BURNING SMELL. MAINTENANCE INSPECTED R/H CIRCUIT BREAKER PANEL AND ASSOCIATED WIRING WITH NO FAULTS FOUND. INSPECTED BFCU AND ASSOCIATED WIRING, FOUND CONTROLLER MI TRIPPED AND WOULD NOT RESET. REPLACED BPCU AND OPS CHECK GOOD. AIRCRAFT RETURNED TO SERVICE.