What was found
APU HAS A HISTORY OF OIL SERVICING. CURRENT OIL CONSUMPTION IS HIGHER THAN EXPECTED. ACFT GROUNDED. REMOVED APU EGT THERMOCOUPLE 1,IAW AMM 49-71-21-000-801. INSPECTED APU TURBINE EXHAUST DUCT FOR EXCESSIVE OIL LEAKAGE WITH FLEXIBLE BORESCOPE IAW FIM 49-95-TASK 801. NO DISCREPANCIES NOTED. REINSTALLED APU EGT THEMOCOUPLE 1, IAW AMM 49-71-21-400-801. OPS TESTED GOOD. ACCOMPLISHED STEPS 1 AND 2 OF THIS TSR, IAW FIM TASK 49-95 TASK 801. FOUND APU OIL COOLER INTERNAL AND EXTERNAL CONTAMINATION OF AIR FINS. REMOVED AND REPLACED APU OIL COOLER, IAW AMM 49-91-41. OPS AND LEAK CHECKED GOOD.