As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ABOUT 30 MILES FROM PHL AIRPORT AT 9,000 FEET, AN ODD SMELL STARTED. FLIGHT ATTENDANT THEN CALLED US & ASKED IF WE SMELL SOMETHING. WE THEN USED OXYGEN FOR REMAINDER OF FLIGHT & AT GATE NOTED AMBER FAN INDICATION ON COND PAGE. SUSPECT CIRCULATING FAN AS PROBLEM. REPLACED CABIN RECIRCULATION FAN 1 & OPERATIONS CHECKED OK IAW AMM 21-21-51.