As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FOUND FAULT 73-20771 "PS3 SIGNAL IS OUT OF RANGE" FOR NR 1 ENGINE. LONG TERM FAULT. ACFT GROUNDED. VERIFIED THAT FAULT CODE 73-20771 IS STILL PRESSENT. R & R THE NR 1 ENGINE EEC IAW AMM 73-21-60-400-801-F00. ACTUATORS TEST OK. ACCOMPLISHED FADEC SVS TEST, OPS NORMAL IAW MM 73-21-00-700-802-F00. RUN ENGINE AND VERIFIED THAT THERE ARE NO FAULT MESSAGES.