As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
YQB FLIGHT 3072 - THE CREW REPORTED AFTER TAKEOFF A LOUD CLUNK ALONG WITH VIBRATION FELT IN FLIGHT CONTROLS. MAINTENANCE INSPECTED AND FOUND THE NOSE GEAR UPLOCK PROXIMITY SWITCH "A" OPEN. THE PROXIMITY SWITCH WAS REPLACED AND OPERATIONAL CHECKS WERE GOOD.