As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) FLIGHT CREW HAVE NR 2 DOOR INDICATION IN FLIGHT AFTER TAKEOFF, FLIGHT CREW DECIDE TO COMPLETE A FLIGHT TURN BACK. ONCE AIRCRAFT WAS INSPECTED MAINTENANCE PERSONNEL REPOSITION THE NR 2 DOOR PROXIMITY SENSOR SLEEVE AND ICE REMOVED IAW 52-71-41 FROM THE DOOR. AIRCRAFT RELEASE TO SERVICE.