What was found
DURING DESCENT AROUND 10,000 FT AN ODOR WAS NOTICE THAT SEEMED TO SMELL LIKE A MUSTY BURNING. IT WAS SHORT LIVED, BUT RETURNED ON THE GROUND. WORK CARRIED 0550-2002 WAS ACCOMPLISHED TO IDENTIFY ISSUE. HEAVY OIL SATURATION WAS FOUND IN APU INLET UP INSIDE ENTIRE COMPRESSOR SECTION LEADING TO TYPE 1 CORRECTIVE ACTION BEING REQUIRED W/MCC BEING NOTIFIED W/LEVEL B W/C 2100-2005 BEING THE REQUEST W/C TO ACCOMPLISH. (CONT. ON LOG 8583701). ACCOMPLISHED W/C 2100-2005 AFTER FWDING APU TO MEL 49-10-01A. LR & R CABIN AIR FILTERS DUE TO FUME EVENT REF A321 AMM 21-21. (LP: 8421398)