What was found
F/A NOTICED AN ACRID ODOR AT 1300 FT ON ARRIVAL. TURNED OFF ALL CABIN LIGHTS, ODOR DISSAPATED YET NEVER WENT AWAY. W/C 2120-2367, FOUND RECIRCULATION FAN WITH SMOKE ODOR AND EXCESSIVE VIBRATION. R & R RECIRCULATION FAN IAW AMM 21-20, CONTACTED OK FOR SERVICE.