As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BIS - FLT 912 - UPON ARRIVAL AT BIS, MAINTENANCE NOTICED VAPOR EMITTING FROM BATTERY VENT HOLE. UPON FURTHER INVESTIGATION FOUND NR 1 AND NR 2 MAIN AIRCRAFT BATTERIES TO BE EXCESSIVELY HOT. REPLACED NR 1 AND NR 2 MAIN AIRCRAFT BATTERIES. REPLACED DC TRANSFER BUS RELAY. TESTED BATTERY CHARGER TEMP SENSOR. PERFORMED DC EMERGENCY POWER SYSTEM AND BATTERY CHARGER OPERATION TEST. DC GENERATION SYSTEM CHECK NORMAL. (M)