What was found
A MUSTY ODOR DURING DESCENT. AN APU TEST DUPLICATED FAULT. ACCOMP TSM 49-00-81-810. FOUND APU OIL LEVEL OVERSERVICED. REPLENISH LEVEL IAW AMM 49-00-00. ALSO ALSO FOUND IGV ACTUATOR LEAKING. ACTUATOR REPLACED IAW AMM 49-23-51. LEAK CHECKED GOOD. ECS DECONTAMINATION ACCOMPLISHED IAW AMM 21-00-00-615-004-A. BOTH RECIRCULATION FILTERS WERE REPLACED IAW AMM 21-21-41. BOTH ENGINES RAN AND APU OPERATION ACOMPLISHED WITH PACKS RUNNING. NO FURTHER FAULT OR ODOR NOTED. ACFT IS OK FOR SERVICE.