As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIR RETURN 30 MINS INTO FLIGHT DUE TO STRONG ODOR REPORTED IN MAIN CABIN. SMELL OF BURNING OR SMOKE PROMINENT AT ROW 8-10 REPORTED. RECIRCULATION FAN CIRCUIT BREAKER POPPED. REPLACED RECIRCULATION FAN IAW AMM21-25-02-400-801. ROTABLE PARTS CHANGE WAS INDICATED - TT # 1571410 SN OFF 03399 FAN, AIR, DISTR OFF 29-2125-9-0001 3399 ON 29-2125-9-0001 0536 IAW LP 7527058