As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: WHILE PERFORMING BITE CHECK OF ESPU SYSTEM DUE TO L/H WING OVER-WING SLIDE REPLACEMENT. LOW BATTERY FAULT DISPLAYED DURING BITECHECK. MAINTENANCE REMOVED AND REPLACED BATTERY AT LOCATION 11WL IAW AMM 33-51-38.