As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAIN LANDING GEAR DOWN LOCK SWITCH WIRE HARNESS CLAMP THAT ATTACHES TO DOWN LOCK HOOK WAS INSTALLED ON OUTSIDE OF HOOK/DOWN LOCK OVER CENTER ASSEMBLY. THIS CLAMP WAS BENT OUT, RESULTING IN HITTING UPLOCK SWITCH BRACKET AND BREAKING BRACKET. UPLOCK SWITCH AND BRACKET DEPARTED AIRCRAFT AND RIPPED WIRES FROM DOWN LOCK SWITCH. THIS RESULTED IN INCOMPLETE LANDING GEAR EXTENSION AND MAIN LANDING GEAR COLLAPSED ON ROLLOUT.