As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LAX - CREW REPORTED STRONG BURNING SMELL OF RUBBER / ONION IN FLIGHT DECK FLOWING INTO THE FIRST CLASS GALLEY AND CAUSING SOME VISIBLE SMOKE IN GALLEY. THE FLIGHT ATTENDANTS TURNED OFF ALL OVENS AND PROBLEM NOT SOLVED. EMERGENCY DECLARED FLIGHT RETURNED LANDED WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. AIRCRAFT CURRENTLY UNDERGOING MAINTENANCE.