What was found
APU CT5ATP EGT TREND DATA SHOWS EGT HAS SHIFTED ABOVE THE MAINTENANCE THRESHOLD OF 593 WITH A HIGH OF 608 DEGREES BEEN RECORD APU HAS PREVIOUS HISTORY OF HIGH CT5ATP. GROUNDED - YES. ACCOMPLISHED APU BITE PROCEDURE PER B737-900 FIM 49-60 TASK 801. NO RECENT FAULTS FOUND. REMOVED AND REPLACED ALL 10 APU FUEL NOZZLES REF B737-900 AMM 49-31-14. REMOVED AND REPLACED BOTH APU EGT THERMOCOUPLES REF AMM 49-71-21/401. COMPLETED FUEL NOZZLE INSTALLATION TEST REF AMM 49-31-14 AND APU EGT THERMOCOUPLES INSTALLATION TEST REF AMM 49-71-21. ALL INDICATIONS NORMAL.