As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
#2 ENGINE EGT TREND DATA SHOWS RECENT GREATER THAN NORMAL SCATTER AND INCREASE IN DELTA EGT/DECREASE IN EGTHDM. ACCOMPLISH FMC CDU FAULTS TASK CARD 78273000 TO CHECK FOR ANY EGT SYSTEM FAULTS. GROUNDED - YES. WHILE ACCOMPLISHING TASK CARD 78273000, FOUND CJ10 HARNESS TO HAVE FAILED. REMOVED AND REPLACE CJ10 HARNESS ON #2 ENGINE PER B737-900 AMM 73-21-06. ACCOMPLISHED ALL FADEC SYSTEM TEST IAW AMM 73-21-00-700-802-F00 NO FAULTS OR DISCREPANCIES TO NOTE.