What was found
(AIRCRAFT NOT GROUNDED) DIRTY SOCK OUT OF 15K ON DECENT TILL LANDING / DURING TC 21-000-002 FOUND TRANSFER TUBE ON APU COOLING FAN LEAKING. REMOVED AND REINSTALLED TRANSFER TUBE ON APU COOLING FAN WITH NEW O-RINGS. OPS AND LEAK CHECK GOOD. IAW AMM 49-52-51-000-002 AND AMM 49-52-51-400-002-AITEM: 1REMOVED AND REINSTALLED TRANSFER TUBE ON APU COOLING FAN WITH NEW O-RINGS. OPS AND LEAK CHECK GOOD. IAW AMM 49-52-51-000-002 AND AMM 49-52-51-400-002-A.PERFORMED APU COMPARTMENT CLEANING , APU DOORS AND APU INTAKE AND DIFFUSER AND ELBOW IAW AMM 49-00-00-100-003-A,AMM 49-00-00-100-807-A AND AMM 49-16-00-100-005ITEM: 1PERFORMED APU COMPARTMENT CLEANING , APU DOORS AND APU INTAKE AND DIFFUSER AND ELBOW IAW AMM 49-00-00-100-003-A,AMM 49-00-00-100-807-A AND AMM 49-16-00-100-005.