What was found
ELECTRICAL ODOR AFTER TAKE OFF BY DOOR 3L, AND MOVED TO FWD CABIN. GONE IN 2 MINUTES. VISUALLY INSPECTED AREA DOOR 3L, ALSO UNDER SEAT 42, 43, NO ELECTRICAL ODOR. GND OPS CHECK & VISUAL INSPECTED SEAT 3A & 6A, NO ELECTRICAL ODOR. CREW REPORTED TRANSIENT ELECTRICAL ODOR DURING TAKEOFF IN AREA OF DOOR 3L, SEAT 3A AND SEAT 6A. FOUND GALLEY HEATER DOOR 3 AFT FULL HIGH ON SYNOPTIC DISPLAY. INSPECTED GALLEY 3 AFT HEATER AREA FOR DISCOLORATION, NONE FOUND. RESET HEATER TO OFF. PERFORMED AIR DISTRIBUTION HEATER TEST IAW AMM B787-A-21-45-00-02A-300B-A. TEST PASSED. PERFORMED FIM B787-A-21-20-F5-72A-421A-A FOR FUMES IN CABIN. NO FAULTS FOUND. OK TO CONTINUE