As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) APPROXIMATELY 7 HRS IN TO FLIGHT, AN ELECTRICAL BURNING ODOR, OR AN ODOR OF MELTING PLASTIC WAS DETECTED IN THE MID GALLEY. ODOR RAPIDLY DISSIPATED. OCCURED CONCURRENTLY WITH STATUS MESSAGE RECIRCULATION FAN. REPLACED FWD UPPER RECIRCULATION FAN IAW AMM 21-25-01-401. OPERATION CHECKED OK.