As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DIAGNOSTICS REPORTED NR 2 ENGINE TREND DATA SHOWS A SHIFT IN EGT HOT DAY MARGIN ALL OTHER PARAMETERS NORMAL. EGT INDICATION ERRORS ARE SUSPECTED. ACFT GROUNDED. PERFORMED A NR 2 ENGINE BITE. FOUND ECONOMIC FAULT 77-10842 ON RECENT FAULTS AND FAULT HISTORY. FOUND THE T49.5 S1 DASHED OUT UNDER INPUT MONITORING. PERFORMED AN EGT AND TEMP PROBE CLEANING. S1 READINGS RESTORED IAW AMM 77-21-00.