As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING LANDING GEAR EXTENSION, THE LT MAIN FAILED TO EXTEND. POST ACCIDENT INVESTIGATION REVEALED THAT THE LT GEAR ACTUATOR, PN 99-810057-653 HAD FAILED AND THE DRIVE END CASTING BROKE OFF. THE ACTUATOR INBD SUPPORT BEARING WAS BROKEN (PN B543) THE ACTUATOR WAS REPLACED 377.5 HOURS BEFORE FAILURE.