As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
R/H DR4 EMER PWR SUPPLY BATT M33409 CAPACITY CHK FAIL TRANSFER REF NR HX WO.1120586 AND ORIGINATED BY EMP NO.V920591. R/H DR4 EMER PWR SUPPLY BATT M33409 BATTERY REPLACED AND INSTALLATION TEST CARRIED OUT RESULT NORMAL AS PER AMM 33-51-06. IDT INSPECTED BY HX136003.