As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SUPPORT TASK - DR 3 LH EMERGENCY POWER SUPPLY ASSY (M33400) INTERMITTENT FAULT DURING OPERATIONAL TEST. TRANSFER HX NON-ROUTINE WO.2429873 AND . DR L3 M33400 EMER LIGHT BATTERY AND BATTERY CHARGER REPLACED AND TESTED NORMAL AS PER AMM33-51-06.