What was found
DIAGNOSTICS REPORTS, NR 1 ENGINE TREND DATA SHOWS A SHIFT IN EGT HOT DAY MARGIN ALL OTHER PARAMETERS NORMAL. EGT INDICATION ERRORS ARE SUSPECT. ACFT GROUNDED. PRE CLEANING T49.5 NR = S1-157.2, S2-129.5, S3-133.3, S4-166.5. REPLACED CJ10 HARNESS DUE TO EXCESSIVE HEAT DISCOLORATION AND GRIME IN SOCKETS. POST CLEANING NRS=S1-24.2, S2-13.4, S3-14.5, S4-31.2. ALL NRS WITHIN LIMITS. GROUND VERIFICATION SATISFACTORY. TEST PASS REF AMM 73-21-06, 77-21-00.