As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
A/C LOST POWER AT GATE PRIOR TO DEPARTURE. ACFT WILL NOT POWER UP. SUSPECT BATTERY VOLTAGE LOW. REPLACE MAIN AND APU BATTERYS. REPLACED APU BATTERY CHARGER. OPERATION NORMAL. REPLACED MAIN BATTERY CHARGER. GRD CHECKED NORMAL. ACFT OK FOR SERVICE.