What was found
DURING NON ROUTINE CHECK, FOUND EMERGENCY LIGHT TEST FAILED AT LT EPSU FAULT. REPLACED LT EPSU BATTERY AND FUNCTIONAL CHECK WAS NORMAL.
As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
DURING NON ROUTINE CHECK, FOUND EMERGENCY LIGHT TEST FAILED AT LT EPSU FAULT. REPLACED LT EPSU BATTERY AND FUNCTIONAL CHECK WAS NORMAL.