What was found
AIRCRAFT WAS GROUNDED: DURING IDLE DESCENT, WHEN HIGH PRESSURE ENGINE VALVES ARE OPEN WE SMELLED A CONTINUOUS STRONG STALE MUSTY ODOR. NOTE: APU WAS NOT ON. **SUPPLEMENTAL REPORT FOR AALA202110117545: REPLACED THE FOLLOWING LEFT AIR CONDITIONING PACK COMPONENTS; REHEATER, EXTRACTOR WATER (AALA202110145905), CONDENSER (AALA202110148953) AND OZONE FILTER (AALA202110146853) PER TASK CARD 26L00021004, AMM 21-52-31, AMM 21-52-32, AMM 21-52-51 AND AMM 21-51-41. ALSO CLEANED THE LEFT-HAND FLOW CONTROL VALVE PER EA 331174. (AALA202110141264) REPLACED THE FOLLOWING RIGHT AIR CONDITIONING PACK COMPONENTS; REHEATER (AALA202110142400), EXTRACTOR WATER (AALA202110145387), CONDENSER (AALA202110142256) AND OZONE FILTER (AALA202110143569) PER TASK CARD 26L00021004, AMM 21-52-31, AMM 21-52-32, AMM 21-52-51 AND AMM 21-51-41. ALSO CLEANED THE RIGHT-HAND FLOW CONTROL VALVE PER EA 331174. (AALA202110147084) ** (CLOSED)