As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FUMES IN COCKPIT SMELLS LIKE METAL BURNING UNKNOWN SOURCE IN INITIAL DESCENT 15-20 MINUTES FOLLOWED QRH AND FUMES STARTED TO DISSAPATE. PERFORMED SMOKE INSPECTION IAW FIM 21-21-00 TROUBLESHOT AND FOUND TO BE COMING FROM GALLEY HEATER. REFER TO LOG PAGE 640989 ITEM 2. STOWED CREW O2 MASKS IAW AMM 35-11-12.