What was found
FUME EVENT ON DESCENT TURN OFF PACK 1. DESCRIPTION OF ODOR/FUMES: PERSISTENT, DIRTY SOCKS / OIL BURNING SMELL. APPARENT CABIN SOURCE: COCKPIT. FLIGHT DECK. NO VISIBLE SMOKE/HAZE. NO MEDICAL ATTENTION REQUIRED.-PERFORMED TSM 05-50-00-810-831-A. DECESION VALUE TABLE POINTED TOWARDS APU. UPON INSPECTION OF THE APU IAW AMM 49-00-00-200-811 FOUND APU OVER SERVICED. SERVICED TO CORRECT LEVEL IAW AMM 49-90-00. FOUND HYDRAULIC FLUID AROUND APU DOORS AND DOOR SEALS. NOT INSIDE APU. FOUND BLUE HYD PUMP LEAKING LEAVING TRAIL TOWARDS APU