What was found
FAULT CODE APPEARED ON THE NR 2 ENGINE, FAULT CODE 77-20862, BOTTOM LEFT EGT SIGNAL, T495S3 IS OUT OF RANGE. ACFT GROUNDED. T49.5 S3 PROBE CHANNEL B FAULTING AND SHOWS DASHES ON INPUT MONITORING. FAULTS SHOWN ON EVERY LEG. J10 HARNESS RANG OUT WITH NO RESULTS REF B737-800 WDM 77-21-11. INPUT MONITORING THEN SHOWED A VALUE AFTER RE-ASSEMBLY. DUE TO INTERMITTENT NATURE AND HISTORY, CJ10 HARNESS REMOVED AND REPLACED REF B737-800 AMM 73-21-06. OPERATIONAL CHECKS GOOD, NO FAULTS, AND PROBE VALUES WITHIN TOLERANCE. GROUND VERIFICATION SUCCESSFUL.