As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EPSU EXT LOAD EMERGENCY LIGHT FAULT DURING EMERGENCY LIGHT TEST. TROUBLESHOT PER TSM. REPLACED EPSU AND BATTERY 11WL, NO HELP REINSTALLED OLD UNIT. TEST ON PSU 11WL SHOWS RED LED FAULT EXTERIOR LIGHTS BUT ALL LIGHTS COME ON TEST ON 11WL.