What was found
FLT#182, BNA-FLL. ' DURING DESCENT APPROACHING 10,000 DETECTED A STRONG DIRTY SOCK SMELL TOXIC FUMES ODOR WAS PRESENT UNTIL LANDING AND PERSISTENT. ODOR WAS VERY STRONG IN COCKPIT AND CABIN SOURCE OF ODOR IS VENTILATION SYSTEM; COMPLIED WITH INFONOTICE 2017-T015J IDENTIFIED SOURCE OF ODOR TO BE APU OIL LEAK. PERFORMED ECS DECON WITH GROUND UNIT. REMOVED AND REPLACED LH/RH RECIRC FILTERS. AIR QUALITY CHECK GOOD. APU TO BE PLACED ON MEL . PER AMM 21-52-00.'