What was found
WITH APU RUNNING RIGHT GEAR WELL FILLS WITH SMOKE. WHEN APU LOADED WITH PACKS CABIN HAS BURNING SMELL. *S/D* FOUND EXTENSIVE WEAR OUT, 1ST STAGE DIFFUSER CORRODED, ERODED AND COKED. EROSION ON TURBINE WHEEL, SHROUD, NOZZLES AND NOZZLE SUPPORT. TURBINE WHEEL BEARING SLEEVE BURNT. C1 - C2 AND CROSSOVER DUCTS HAD HEAVY BUILD UP. TURBINE WHEEL BLADE TIPS ERODED OFF 365 DEGREES. ALL NOZZLE GUIDE VANES BURNT/ERODED. HEAVY COKING THROUGHOUT. PERFORMED HEAVY MAINTENANCE.