As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
IMMEDIATLY AFTER T/O, F/AS CALLED TO REPORT SMOKE IN THE CABIN. SMOKE DETECTORS IN MID AND AFT LAVS ACTIVATED. SMOKE WAS VISIBLE WITH AN ELECTRICAL BURNING SMELL. FWD EQ EXH FAN EICAS MSG WITH STRONG ELECTRICAL SMELL IN FWD CABIN AREA. REMOVED AND REPLACED FWD EQUIP EXHAUST FAN PER M/M ETOPS CATEGORY 'B': DIVERSION OR TURNBACK