As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) A JUST OVERHAULED MAIN LANDING GEAR ACTUATOR HAD BEEN INSTALLED. DURING GROUND RETRACTION TEST, WHEN WHEELS WERE LOWERED, THE ACTUATOR DID NOT HAVE ANY DAMPENING, WHICH RESULTED IN A NOT-CONTROLLED DESCENT OF GEAR AND THE BREAKAGE OF THE WHEEL DOWNLOCK SYSTEM.