As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON APPROACH, SMOKE STARTED FILLING THE FLIGHT DECK AND THE CREW DONNED THEIR SMOKE MASKS, NO EMERGENCY DECLARATION WAS MADE TO ATC. THE LANDING WAS NORMAL WITHOUT FURTHER ISSUE AND THE AIRCRAFT CONTINUED ON TO THE GATE. FLIGHT CREW NOTED THAT THE SMOKE APPEARED TO BE COMING FROM THE NR 1 ARCDU. ENGINEERS REPLACED THE NR 1 ARCDU.