What was found
FLT#2188, BNA-LGA. 'DESCENDING FROM ALTITUDE FROM 25000-18000 SMELLED DIRTY SOCKS IN COCKPIT AND REAR CABIN THRUST IDLE CLEAR AIR APU OFF ODOR INCREASE AS POWER CAME IN DURING LEVEL OFFS STARTED DISSIPATING LOWERAPU INOP ( APU SYSTEM ); PERFORMED APU INSPECTION PER AMM 49-00-00-200-811-A. APU HAS BEEN REPLACED ON 10/16/2023 NO EVIDENCE OF OIL OR FUEL FOUND, RAN APU FOR COUPLE HOURS AND NO SMELL OR FUMES INSIDE CABIN NOTED. MDDR 527763 CLEARED. MX-4 UPDATED, PLACARD REMOVED. MCC NOTIFIED.'