What was found
DO THE SMOKE OR FUMES IN THE CABIN, SOURCE UNKNOWN - FAULT ISOLATION PER FIM 21-00 TASK 806. TOMC PL CREW BRIEFED THAT SMELL WAS COMING FROM LAV E, SAID THEY BELIVE THE SMELL WAS COMING FROM UNDER THE SINK. FOUND CB 18-3 F15 LAVATORY E WATER HEATER POPPED. PUSH IN BREAKER & WATER HEATER DOES NOT INDICATE ANY POWER. BELIEVE ODOR OF ELECTRICAL BURNING WAS CAUSED BY LAV E WATER HEATER SYSTEM, FURTHER TROUBLESHOOTING REQUIRED, R & R WATER HEATER ON LAV E, REF. AMM 38-13-01 OPS CHECK GOOD AT THIS TIME. AFTER REPLACEMENT OF WATER HEATER, LEFT WATER HEATER & APU POWER ON FOR AN EXTENDED AMOUNT OF TIME AND COULD NOT DUPLICATE SMOKE OR FUMES SMELL IN THE ACFT.