As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EPSU TEST FAILS 13WL AFT LT EMERGENCY SLIDE LT. PERFORMED TSM 25-62-00-810-819-A REMOVED AND REPLACED 13WL ESPU AND FAILS EXTERIOR LIGHTS. CONTINUED TROUBLESHOOTING AND FOUND CONNECTER UNDER SLIDE COVER AT L2 DOOR SLIDE DISCONNECTED. RECONNECTED SLIDE WIRE HARNESS AND EPSU TEST OK, REF AMM 33-51-38 PB 401.