What was found
AIRCRAFT WAS IN BASE MAINTENANCE: CIDS 1 FAULT EXIT SIGNS/ESPU (13WL) AFT L. REPLACED EPSU BATTERY.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
AIRCRAFT WAS IN BASE MAINTENANCE: CIDS 1 FAULT EXIT SIGNS/ESPU (13WL) AFT L. REPLACED EPSU BATTERY.