What was found
WHILE PERFORMING FMC CDU INTERROGATION, THE FOLLOWING FAULT DISPLAYED FOR THE NR 2 ENGINE. MESSAGE 77-20862. BOTTOM LEFT EGT SIGNAL IS OUT OF RANGE (T495S3) FLT LEGS 0, 1, 2, 3. ACFT GROUNDED. NR 2 ENGINE 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 IAW WDM 77-21-11. INPUT MONITORING THEN SHOWED A VALUE AFTER ASSEMBLY. DUE TO INTERMITTENT NATURE AND HISTORY, CJ10 HARNESS REMOVED AND REPLACED IAW AMM 73-21-06. OPS CHECKED GOOD, NO FAULTS, AND PROBE VALUES WITHIN TOLERANCE. GROUND VERIFICATION SUCCESSFUL.