As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NR 1 ENGINE BITE SHOWS FAULT 77-20871, TOP LEFT EGT OUT OF RANGE ECONOMIC FAULT. ACFT GROUNDED. VERIFIED FAULT MESSAGE, S4 SHOWS DASHES ON INPUT PAGE. SHAKEDOWN OF CJ10 CAUSE INPUT TO GO IN AND OUT. REMOVED & REPLACED CJ10 HARNESS IAW AMM 73-21-06-400-803, FADEC SYSTEM TEST PASSED ENGINE RUN CONFIRMS.