What was found
FLT 613, HPN-FLL. ON DESCENT AT FL 280 SMELLED A MODERATE MUSTY CHEMICAL SMELL IN FLIGHTDECK. ODOR LASTED APPROX 20 MIN AND WAS CONSISTENT UNTIL PACK1 AND XBLEED VLV SHUT PER FUMES/ODOR CHECKLIST ; INSPECTED APU BAY AREA: FOUND OIL RESIDUES IN VARIOUS SECTION. CLEANED THE APU BAY& PERFORMED A LEAK CHECK AS REQUIRED IRW A320 AMM 49-00-0: NO LEAKS DETECTED. PERFORMED THE PACK BURN (DECONTAMINATION OF THE ECS) AS REQUIRED IRW A320 21-00-00615-804-A. SMELL DISSIPATED. A/C O.K TO CONT SVC @ THIS TIME. REF INFO NOTICE 2017-T015I