As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ALTERNATE GEAR EXTENSION PERFORMED BECAUSE LEFT MAIN GEAR REMAINED IN THE WHEEL WELL DURING NORMAL GEAR EXTENSION. LEFT MAIN GEAR EXTENDED USING ALTERNATE METHOD. AIRCRAFT LANDED IN PDX WITHOUT FURTHER PROBLEMS. LEFT HAND UPLOCK ACTUATOR REPLACED IAW MAINTENANCE MANUAL, UPLOCK ROLLER LUBED AND GEAR OPS CHECKED GOOD ON GEAR SWING.