What was found
DIAGNOSTICS REPORTS NR 1 ENGINE EGT HDM AND EGT CONTINUES TO SHOW GREATER THAN EXPECTED DATA SCATTER RESULTING IN A TREND SHIFT. INDICATION ERRORS STILL SUSPECT. ACFT GROUNDED. ACCOMPLISHED TROUBLESHOOTING IAW FIM 77-21-TASK 801. INITIAL CHECK OF INPUTS ON CDU SHOWS NO INITIAL FAULTS. ACCOMPLISHED T49.5 PROBE AND EGT SYS INSPECTION IAW AMM 77-21-01-200-801-F00. PROBES S1, S2, AND S3 RESISTANCE IS EXCESSIVELY HIGH. R & R S1, S2 AND S3 T49.5 PROBES IAW AMM 77-21-01. OPS CHECK NORMAL.