What was found
DESCENDING THROUGH 6000 WE FELT A MUSTY SMELL / BURNING SMELL AFTER FOLLOWING QRH WE ISOLATED PACK 1. THE ODOR WENT AWAY. ( PACKS A321 WITHOUT MOD. 157080/MP K17996 (PACK FLOW SELECTOR) AND WITH MOD. 30626/ MP K6443 (ENHANCED ECS) )-PERFORMED 1D OF CABIN ODOR IAW TSM 05-50-00. PERFORMED LEVEL C REMOVAL OF CONTAMINATION OF ECS IAW AMM 21-00-00 AND DECONTAMINATION OF THE BLEED AIR DUCTS LEVEL C IAW AMM 36-10-00. NO SIGNS OF OIL INEC SYS. ALSO CHANGED PACK 1 RECIRCULATION FILTER(FIN:4010HM) IAW AMM 21-21-45. THIS CLEARS DMI #3313817-1. PLACARD REMOVED, MOC NOTIFIED & DMI LOGPAGE UPDATED.