As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CMX - FLT 3125 - ON APPROACH, LT GEAR DID NOT EXTEND UPON GEAR EXTENSION. THE CREW PERFORMED AN ALTERNATE GEAR EXTENSION AND THE GEAR EXTENDED NORMALLY. THE AIRCRAFT LANDED WITHOUT INCIDENT IN CMX. MAINTENANCE REPLACED THE UPLOCK ACTUATOR. SYSTEM OPERATED SATISFACTORILY. (X)