What was found
EXTERNAL POWER SHUTOFF ON ITS OWN. AND F/A NOTCIED AT THE SAME TIME A POP AND SPARK CAME FROM THE GALLEY AREA, NEAR THE COFFEE URN OR UNDER GALLEY LIGHT AREA, AND A DISTINCT ELECTRICAL ODOR NOTCED IN COCKPIT. ALSO "CLOCK 2" (E6) POPPED, WILL NOT RESET. REPLACED NR 2 FMS, NR 2 CLOCK, F/A CONTROL PANEL, AND AFT GALLEY LIGHT BULB - ALL CHECKS GOOD. CLEARED EPCU CODES - ALL CODES CHECK GOOD / CLEARED. ACFT RETURNED TO SERVICE.