What was found
WHILE PERFORMING EMERGENCY SYSTEM TEST FOR SLIDE CHANGE BY-BACK, MESSAGE (BATTERY AFT LEFT ATA 33-51-48) CAME INTO VIEW ON CIDS PANEL. REPLACED EPSU BATTERY 13WL AFT LEFT. OPS CHECKS NORMAL.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
WHILE PERFORMING EMERGENCY SYSTEM TEST FOR SLIDE CHANGE BY-BACK, MESSAGE (BATTERY AFT LEFT ATA 33-51-48) CAME INTO VIEW ON CIDS PANEL. REPLACED EPSU BATTERY 13WL AFT LEFT. OPS CHECKS NORMAL.