As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE ACCOMPLISHING TASK CARD 78273000 ENGINE NR 2 LOGGED SHORT TIME FAULT CODE 73 21272 (THE ALTERNATOR VOLTAGE INPUT TO THE EEC IS OUT OF RANGE.) PERFORMED FIM TASK 73 27 00 810 804 F00 ALTERNATOR VOLTAGE INPUT TO THE EEC IS OUT OF RANGE. AT STEP F3 FOUND CH B PIN 2 TO PIN 4 OUT OF RANGE. REPLACED NR 2 ENGINE EEC ALTERNATOR STATOR AND ALTERNATOR ROTOR ASSY'S REF M/M 73 21 08 OPS CHECK NORMAL. PERFORMED FCC BITE CHECK. NO FAULTS LOGGED AFTER ENGINE RUN.