What was found
BLANK RED BOX ON #2 ENG AFTER ENGINE SHUTDOWN. GROUNDED - YES. PER B737-900 FIM 71-06 TASK 805 ACCOMPLISHED EGT CLEANING REF B737-900 AMM 77-21-00. EGT T495 TEMPS BEFORE CLEAN, S1-228.97, S2- 208.75, S3- 207.46, S4- 229.80. EGT T495 TEMPS AFTER CLEAN, S1- 114.53, S2- 63.09, S3- 63.12, S4- 112.41. FURTHER TROUBLESHOOTING FOUND NO FAULTS/MAINT MSG FOR #2 ENGINE IN RECENT FAULTS OR FAULT HISTORY. NO HISTORY REGARDING #2 EGT IN OVER 365 DAYS IN A/C HISTORY. EGT TEMPS ARE WITHIN NOMINAL RANGE; S1: 47.62, S2: 19.61, S3: 19.19, S4: 47.81. REF FIM 71-06 TASK 805.