As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING DRC, HEARD AFT 2L SMOKE DETECTOR AND SAW SMOKE IN AFT CABIN. FOUND CIRCUIT BREAKER TRIPPED FOR APU BATTERY CHARGER UNABLE TO RESET. TROUBLESHOT IAW WDM 24-31-41, REMOVED CONNECTOR FROM APU BATTERY CHARGER ABLE TO RESET CIRCUIT BREAKER. R & R APU BATTERY CHARGER IAW AMM 24-31-06. OPS CHECKED NORMAL. OK FOR SERVICE.