As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
GE DIAGNOSTICS REPORTS NR 2 ENGINE TREND DATA CONTINUES TO SHOW A SHIFT IN DELTA CRUISE AND TAKEOFF MARGIN INDICATIVE OF EGT INDICATION ERRORS. ACFT GROUNDED. ACCOMPLISHED T49.5 PROBE & EGT SYS INSPECTION. FOUND PROBES S1 & S4 AND HARNESS CJ10 OUT OF LIMITS. REPLACED SAME. OPS TEST GOOD. GROUND VERIFICATION SUCCESSFUL REF AMM 77-21-01-200-801-F00.