As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AIRCRAFT DEPARTED BUT PERFORMED AN AIR-RETURN DUE TO THE NOSE GEAR DOOR INDICATION LIGHT FLASHING INTERMITTENTLY AFTER GEAR RETRACTION. THE FLIGHT CREW ACTIONED THE QRH AND THE ALTERNATE GEAR PROCEDURE WAS CARRIED. THE AIRCRAFT LANDED WITHOUT INCIDENT. THE MAINTENANCE CREW INVESTIGATED AND RIGGED THE NOSE GEAR DOOR TO A NOMINAL VALUE. (TC# 20190508007)