As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
INTERROGATED THE FMC CDU FOR ENG FAULTS FOUND SHORT TERM FAULT CODE 73 21271 (NR 1 ENG). THE ALTERNATOR VOLTAGE INPUT TO THE EEC IS OUT OF RANGE. ACCOMPLISHED FIM TASK 73 27 00 810 804 F00 AT STEP F3 FOUND CONNECTOR DP0802 LOOSE. TIGHTENED CONNECTOR. REPAIR CONFIRMATION SATISFACTORY.