As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 ENGINE SHOWS LONG TERM FAULT CODE 77 20871 "TOP LEFT EGT SIGNAL IS OUT OF RANGE" LOGGED FOR NINE OF THE TEN LEGS IN EEC MEMORY. ACCOMPLISHED FIM TASK 77-21-00-810-804-F00 CLEANED EGT REF AMM 77-2100. CHECKED RESISTANCE OF HARNESS. (DP1011). RESISTANCE READS 150 OHMS. REPLACED ENG NR1 (DP1011) HARNESS IAW AMM TASK 73-21-06-000-803-F00 AND 73-21-06-400-803-F00. ACCOMPLISHED FADEC SYS TEST TASK 73-21-00-700-802-F00. TEST PASSED.