As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SFO - CREW REPORTED LOUD SOUND AND VIBRATION FROM CEILING IN FRONT OF FIRST CLASS AROUND GALLEY. EMERGENCY DECLARED FLIGHT LANDED SFO WITHOUT INCIDENT. AIRCRAFT REMOVED FROM SERVICE. REPLACED BROKEN DUCT AND CLAMP IN LEFT PACK BAY THAT WAS BROKEN. SYSTEM GROUND CHECK NORMAL OPERATION.