As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) AN ALTERNATE GEAR EXTENSION TEST WAS CARRIED OUT AFTER MLG REINSTALLATION. THE NR 1 MLG FAILED TO EXTEND, GEAR DOORS REMAINED CLOSED. INVESTIGATION REVEALED THE LEVER THE ALTERNATE EXTENSION CAM MECHANISM HAD FAILED. OPERATOR HAS INSPECTED TWO INSPECTED TWO OTHER AIRCRAFT WITH NO FAULT FOUND.