As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MAIN LANDING GEAR UPLOCK SUPPORT BRACKET CRACKED ALLOWING UPLOCK HOOK TO LOCK SIDEWAYS LODGING BETWEEN ROLLER AND GEAR LEG. LEFT MAIN GEAR WOULD NOT EXTEND UNTIL AIRCRAFT WAS PUT THROUGH NEGATIVE GRAVITY. SECOND AIRCRAFT FOUND WITH THIS PROBLEM.