As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MIA - FLT 0911 - BOTH UTILITY BUSSES CYCLE OFF THEN ON AT ABOUT 1 MINUTE INTERVALS. TURNED OFF ALL GALLEY OVENS AND BOTH RECIRC FANS AND PROBLEM CONTINUED. TRIED USING ONE UTILITY BUS. PROBLEM CONTINUED. BOTH BUSSES TURNED OFF REMAINDER OF FLIGHT. REPLACED THE BUS CONTROL UNIT. ACCOMPLISHED ENGINES 1 AND 2 RUN-UP. LOADED LT AND RT UTILITY BUSSES, ALL CK'D NORMAL. COULD NOT DUPLICATE FAULT. PLEASE OBSERVE AND ADVISE. (X)