As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU STATUS MSG APU BATTERY.APU CHARGER.ADDITIONAL APU BATTERY OVERHEAT.OVERHEAT WENT AWAY VOLTS APU BATTERY DOWN TO 19V STEADY 1 AMP DISCHARGE__T/S PER FIM R AND R APU BATTERY AND APU BATTERY CHARGER PER FIM STATUS MESSAGE CLEARED CHECKS OK ETOPS CATEGORY 'F': ANY OTHER EVENT DETRIMENTAL TO ETOPS