As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APU BATTERY APU BATTERY FAILURE. STATUS MSG01- ACTIVE CRUISE MODE DEPENDENT; APU BATTERY IS WEAK. DB- ELMS P310 ELECTRONICS UNIT MSG-2413047 ACTIVE ER MODE. MAT SHOWS MTC MSG 24-13047. APU BATTERY STS MSG SHOWING. APU BATTERY DEFERRED PER MEL 2431 C. REPLACED APU BATTERY IAW MM. OPS CHECK NORMAL. VOLTS AND AMPS NORMAL.