What was found
DIAGNOSTICS REPORTS NR 2 ENGINE TREND DATA SHOWS A SHIFT IN EGT HOT DAY MARGIN ALL OTHER PARAMETERS NORMAL. EGT INDICATION ERRORS ARE SUSPECT. ACFT GROUNDED. FOUND NR 2 ENGINE FMC CDU FAULT MESSAGE 73-31372, UPPER EGT SECTORS READING HIGH. RECORDED INITIAL T49 TEMPS S1 235.56, S2 53.33, S3 54.72, S4 107.06. ACCOMPLISHED TROUBLESHOOTING IAW FIM 73-11, TASK 801 AND FOUND THE CJ9 HARNESS WITH A LOW RESISTANCE READING TO GROUND AT THE S1 SENSOR. REPLACED THE CJ9 HARNESS IAW AMM 73-21-06-000-803-F00 AND 73-21-06-400-803-F00. OPS CHECKS GOOD, NO FAULTS. POST T49, TEMPS S1 94.56, S2 35.33, S3 34.70, S4 95.06.