As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) ATB FROM FLIGHT DUE TO RH MLG DOOR FAILED TO CLOSE AFTER GEARS RETRACTED. ALTERNATE EXTENSION USED TO EXTEND GEAR. DURING TROUBLESHOOTING, ONE OF THE UPLOCK EXTENSION SPRINGS WAS FOUND BROKEN INSIDE THE UPLOCK ASSY.\ SPRING REPLACED, GEAR FUNCTIONS CARRIED OUT WITHOUT ISSUE, A/C RTS (TC# 20190314014)