As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MUSTY ODOR FROM PACKS ON TAKEOFF/CLIMB. DISAPPEAR ED IN CRUISE. CAME BACK ON DESCENT. REMOVED AND REPLACED RECIRCULATOIN AIR FILTERS IAW AMM TASK21-25-01-400-801. CONFIRMED WITH TOMC ENGINE WASH ACCOMPLISHED ON SNA ON 09/19/26 OPERATED PACKS NO MUSTY SMELL NOTED.PARTS USED: 29-2124-3-0006, QTY :1 ADD EMP:U354710