As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAIN AIRCRAFT BATTERY INDICATED NR 2 AMPS 27 28 VOLTS FOR ENTERING FLIGHT (2 + 20 HRS). AUX BATT INDICATED 0 AMPS 27 VOLTS AND ALL OTHER ELECTRIC SYSTEMS ARE INDICATING NORMAL. REPLACED BOTH BATTERIES PER MM 24 31 11. INSTALLATION TEST GOOD PER MM 24 31 11.