As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BAT DISCHARGE CAUTION CAME ON IN FLIGHT. #1 GEN SHOWED 0 ON AMPS. T/F EVALUATION REVEALED DURING AN ATTEMPT TO VENT # 1 ENGINE, NO RISE ON # 1 ENG N1. TRIED TO START # 1 ENGINE WITH NO RISE IN # 1 ENGINE N1. NO CIRCUIT BREAKERS POP; BATTERY AND VOLTAGE WITHIN NORMAL RANGE. REPLACED STARTER GENERATOR IAW AMM 24-30-00, 4-2.