As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FOUND DURING PHASE INSPECTION LANDING GEAR RETRACTION TEST; THE LEFT LANDING GEAR RETRACT ACTUATOR JACKSCREW NUT ASSEMBLY BROKE (THREADED SCREW DISCONNECTED FROM CHROME TUBE), AND THE LEFT LANDING GEAR FELL DOWN, BUT NOT LOCKED. PROBABLE CAUSE: BAD ACTUATOR NUT BRAZE. THIS PROBLEM IS ADDRESSED BY MFG SB. THE FAILED ACTUATOR NUT WAS ONE OF THE AFFECTED NUT PART NUMBERS IN SB.