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 DELTA CRUISE AND TAKEOFF MARGIN INDICATIVE OF EGT INDICATION ERRORS. ACFT GROUNDED. FOUND T49.5 SENSORS S1 & S4 OUT OF LIMITS. REPLACED IAW 77-21-01, 77-21-01. GROUND VERIFICATION SUCCESSFUL.