As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AUX BATTERY SHOWS 27 VOLTS AND A 2 AMP CHARGE THROUGHOUT THE FLIGHT. ACFT GROUNDED. PERFORMED BATTERY INSTALLATION TEST FOR AUX BATTERY IAW AMM 24-31-11 AND AUX BATTERY CHARGER OPS TEST IAW AMM 24-31-31. ALL TESTS NORMAL. P5-13 BITE NORMAL, NO MESSAGES LOGGED IAW FIM 24-31 TASK 801.