As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LT MLG UPLOCK ACTUATOR WOULD NOT RELEASE THE LANDING GEAR DURING 'FREE FALL' TEST. DISSAMBLY OF ACTUATOR REVEALED A NON APPROVED SPRING THAT WAS 0.125 INCHES SHORTER THAN THE ORIGINAL MANUFACTURER. THE SCARCITY OF REPLACEMENT PARTS FOR THIS UNIT MAY HAVE CAUSED A PREVIOUS REPAIRER TO USE UNAPPROVED PARTS.