As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AUX BATT AMPS REMAINED AT +2 AMPS FOR OVER 180 MINUTES. VOLTS STEADY AT 27 VOLTS. CONFIRMED BAD AUX BATT BY PULLING AUX BATT CHARGER CB BATT VOLTAGE IMMEDIATELY DROPPED. AUX BATT WAS ALSO HOT TO THE TOUCH AFTER REMOVED. REMOVED & REPLACED BOTH A/C BATTERIES REF M/M 24 31 11 000 802 002 AND 24 31 11 400 802 002. OPS CHECK GOOD PER M/M 24 31 11 400 802 002.