What was found
(AIRCRAFT NOT GROUNDED) DIRTY SOCK SMELL DESCENDING THROUGH 6000 FEET WITH APU OFF. / DURING ODER EVENT APU FOUND LEAKING OIL. PERFORMED A/R 14978-1 NO LEAKS NOTED THIS CLEARS MEL 49-10-01-A MDDR 210274 INOP PLACARDS REMOVED. PERFORMED T/C 21-000-002 NO OIL FOUND IN APU NO DIRTY SOCK SMELL PRESENT AFTER RUNNING APU WITH PACKS ON FOR 3 HOURS. LEAVING MEL 49-10-01-A MDDR 210274 ACTIVE DUE TO PREVIOUS EVENTS- TROUBLESHOOTING UPDATE: PERFORMED A/R 14978-1 NO LEAKS NOTED THIS CLEARS MEL 49-10-01-A MDDR 210274 INOP PLACARDS REMOVED.