As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STATUS MSG BATTERY CHARGER APU. REPLACED-CHARGER, NO HELP. RELOADED ELMS P310 ELECTRONIC UNIT OPC AND OPS SW PER MM24-09-00 PG201 THIS CLEARED THE FAULTS. AFTER RELOAD ACCOMPLISHED TEST OF APU BATTERY & CHARGER. RAN APU FOR HALF HOUR AND THE APU BAT CHARGER POWER CIRCUIT BREAKER ON THE P320 PANEL POPPED. INSTALLED NEW APU BATTERY CHARGER. OP'S CHECKED GOOD.