As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAIN BATTERY STATUS MSG AND BAT CHGR MAIN STATUS MSG DISPLAYED. SWAPPED MAIN BATTERY AND CHARGER WITH APU BATTERY AND CHARGER. MAIN BATTERY S-N 1283 IN APU POSITION. MAIN BATTERY CHARGER MR 24-31 0-63 IN APU POSITION. APU BATT S-N 1051A IN MAIN BATT POSITION. APU BATTERY CHARGER MR 24310-63 IN MAIN BATT POSITION. ALL OPS OK..