As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FOUND APU BATTERY OVERHEATED AND FUMES ON IT DURING APU BITE TEST ON ECU. BATTERY INMEDIATELY DISCONNECTED AND FIRE BRIGADE ADVISED. INSTALLED NEW APU BATTERY IAW AMM 24-31-03-4-0, ALL TEST PASSED PER SAME AMM , STARTED APU TWICE PER JRH ALL PARAMETERS NORMAL, AIRCRAFT OK FOR SERVICE. R & R APU BATTERY CHARGER.