As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT CREW REPORTED SMOKE IN THE COCKPIT ON APPROACH; DONNED O2 MASKS. SMOKE WAS COMING FROM UNDERNEATH THE CAPTAINS TAXI LIGHT CONTROL PANEL. AN EMERGENCY WAS DECLARED. MAINTENANCE FOUND A LOOSE TERMINAL WIRE AT THE LANDING LIGHT/GROUND FLOOD LIGHT SWITCH PANEL. THE TERMINAL WAS RE-SECURED AND THE ACFT HAS RETURNED TO SERVICE.