What was found
CSS FAILED. FAULT LIGHT AND 100 EGT DURING ATTEMPTED START AT FL360. MACH .79 TEMP -60 C. GROUNDED - YES. APU BITE REPORTED FC 49-31016. PERFORMED B737-800 FIM 49-30 TASK 803. FAULT CLEARED & DETERMINED TO BE INTERMITTENT FAULT THAT WAS CORRECTED. PERFORMED MULTIPLE APU STARTS WITH NO FURTHER ANOMOLIES PER FIM 49-30 TASK 803, MEL 49-99A REQUIRED. CHECKED & RELEASED IAW MEL 49-99A. REMOVED AND REPLACED APU ASSY PER ASA TASK CARD 78349010. OPS CHECK GOOD REF B737-800 AMM 49-11-00.