What was found
(AIRCRAFT GROUNDED) DIRTY SOCK SMELL ON DESCENT. FOUND APU LEAKING OIL. REF. WO 522043 FOR PARTS REPLACEMENT. APU OIL COOLER FAN OIL TRANSFER TUBE LEAKING OIL. REMOVED COOLING FAN, REPLACED O-RINGS, AND REINSTALLED REF AMM 49-52-51-04 CONF 16. RAN APU FOR ONE HOUR, LEAK CHECK GOOD. COMPLETED TC 21-000-003, LEVEL A DECON OF ECS REF AIRBUS AMM 21-00-00-615-802-A. NO SMELL DETECTED, OPS CHECK GOOD. REPLACED APU FCU IAW AMM 49-32-11-000-003-A & 49-32-11-400-003-A. OPS CHECK GOOD AT THIS TIME, NO LEAKS NOTED AT THIS TIME. COMPLETED TC 21-000-003, LEVEL A DECON OF ECS REF AIRBUS AMM 21-00-00-615-802-A. NO SMELL DETECTED, OPS CHECK GOOD.