What was found
AFTER APU START WAS ONLY GETTING HOT AIR COMING OUT OF CABIN GASPERS. SELECTED MAX COOL FOR APU THEN SMOKE STARTED FILLING THE PLANE. FOUND BOTH COCKPIT & CABIN TEMP SENSORS TO HAVE DIRT & DEBRIS. CLEANED BOTH TEMP SENSORS. FOUND CABIN TEMP SENSOR FAN INOPERATIVE. VERIFIED POWER IS SUPPLIED TO FAN. R & R FAULTY FAN WITH NEW. OPERATIONS CHECK OF FAN IS GOOD. COMPLIED WITH ECS DUCT BURN OUT IAW TC-750-21-120801M, INSTALLED NEW COALESCE SOCKS IAW TC-750-21-120801M & MM 25-90-60, NO LEAKS. RAN A/C & PERFORMED OPERATIONS CHECK OF CABIN & COCKPIT PACS. RAN CABIN & COCKPIT TEMPS THROUGH FULL TEMP RANGE IN BOTH MANUAL & AUTO WITH NO DEFECTS NOTED. AFTER ENG SHUTDOWN NOTED LARGE AMOUNT OF SMOKE COMING FROM LT ENG INLET & OIL RUNNING FROM EXHAUST. PERFORMED FIM 72-00-00-810-808 FOUND OIL PUDDLING AT LOW PRESS TURBINE. PERFORMED TASK 05-50-00-200-808, PER TABLE 601 REPLACED NR 7 CARBON SEAL REPLACEMENT COMPLETED BY ON WO OWCNA-2014-1236 & CRS O7YD306Y. ACCOMPLISHED NR 7 CARBON SEAL POST ENG RUNS WITH NO DEFECTS NOTED. NO SMOKE OR LEAKS NOTED FROM EITHER ENG. PARTS REPLACED, COALESCE BAG PN 746451-3, NSN, FAN PN 414F, NSN, SEAL ASSEMBLY, CARBON NR 7 PN 23061737, SN KV-4409H.