As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 4160 THE CREW REPORTED THAT AFTER TAKEOFF AND ON CLIMBOUT NOTICED SMOKE/HAZE IN THE COCKPIT AND CABIN. THE CREW DECLARED EMERGENCY AND RETURNED TO FIELD. THE AIRCRAFT LANDED WITHOUT INCIDENT. PERFORMED ETN EM-72-034R4. RAR NR 1 ENG. SPANNER LOCK NUT PLUG O-RING IAW RRMM 72-21-05