As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(CAN) ON APPROACH LH MAIN LANDING GEAR WOULD NOT EXTEND WHEN GEAR SELECTED DOWN. APPROACH WAS ABORTED AND ATC CONFIRMED LH MAIN LANDING GEAR DOOR WAS CLOSED AND GEAR NOT VISIBLE. LH GEAR MANUALLY LOWERED AND LANDING CARRIED OUT. SCREWJACK CONTAMINATED WITH MOISTURE AND GRIME. TEST FLIGHT AND RETURNED TO SERVICE.