As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 48 - DCA-LAS - EMERGENCY LIGHTS - FLIGHT ATTENDANT REPORTED EMERGENCY EXIT LIGHTS IN CABIN CAME ON AND WERE FLASHING THEN STAYED ON IN SPITE, FLIGHT DECK SWITCH IN ARMED POSITION. RECYCLE SWITCH TO OFF TWICE BEFORE LIGHTS WOULD STAY OFF IN ARMED POSITION. REMOVED AND REPLACED EMERGENCY LIGHTS SWITCH 4WL. OPERATIONAL CHECK WAS GOOD.