As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: F/A'S REPORTED WHITE SMOKE AND STRONG ELECTRICAL BURNING SMELL FROM AFT GALLEY. RAN QRH SMOKE/FIRE/FUMES CHECKLIST SMOKE DISSIPATED. MAINTENANCE FOUND DEBRIS IN THE AFT DOOR AREA HEATER. REMOVED AND REPLACED THE HEATER. OPS TEST GOOD IAW AMM 21-45-81.