What was found
FLT#973, JFK-BNA. 'CABIN ODOR DURING APPROACH AND LANDING. CABIN ODOR REPORTING FORM COMPLETED. ( PACKS ); ACCOMPLISHED TSM 05-50-00-810-085 FOUND APU WITH OIL RESIDUE APU IS THE CAUSE OF THE ODOR. REMOVED AND REPLACED BOTH RECIRCULATING FILTERS IAW MM 21-21-41. PERFORMED ENG RUNS AND PACKS OPS CHECK IAW MM 21-51-00. NO ODOR WAS NOTICED, PACK OK TO CONTINUE. SERVICE PACK BURN, ACCOMPLISHED.'