As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ALL EMERGENCY LIGHTS, SIGNS AND PATH LIGHTING BEGAN FLICKERING DURING FLIGHT. MAINTENANCE INSPECTED WIRING AT OVERHEAD COCKPIT FORWARD FLIGHT ATTENDANT SWITCH AND AT CONNECTOR P1-4009, ALL CHECKED NORMAL. DISCREPANCY COULD NOT BE DUPLICATED.