What was found
AIRCRAFT 5043, DURING DESCENT AT 19,000 FT. FA'S REPORTED MUSTY ODOR ORIGINATING AT THE AFT GALLEY AND BEING AS STRONG UP TO ROW 30. THE SMELL LESSENED BUT CONTINUED TO THE FORWARD GALLEY. NO SMELL WAS DETECTED ON THE FLIGHT DECK. SMELL LESSENED SLIGHTLY AT LOWER ALT. REPLACED NR 2 ENG FAN SHAFT COVER SEAL PER AMM 72-15. PERFORM LEVEL B DECONTAMINATION OF ECS AND BLEED SYSTEM REF A321N AMM 21-00 AND AMM 36-10. (LP 9440714, 1818943 - AIRCRAFT WAS GROUNDED)