As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON SELECTING THE LANDING GEAR DOWN, THE LEFT MAIN GEAR WOULD NOT EXTEND AND THE RED GEAR UNSAFE CAUTION LIGHT ILLUMINATED. THE CREW DECLARED AN EMERGENCY AND EXTENDED THE GEAR USING THE ALTERNATE EXTENSION SYSTEM. MAINTENANCE CHANGED THE LANDING GEAR SELECTOR HANDLE ASSEMBLY AND PERFORMED EXTENSIVE CHECKS OF THE SYSTEM. OPERATIONAL CHECKS WERE GOOD AND THE AIRCRAFT WAS RELEASED FOR SERVICE.