As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BTV - UPON DESCENT, THE LEFT MAIN GEAR DID NOT EXTEND WHEN SELECTED. GEAR EXTENDED 45 SECONDS LATER WITH DOWN AND LOCKED INDICATION. MAINTENANCE REMOVED AND RPELACED THE LEFT MAIN GEAR UPLOCK ACTUATOR IAW CHAPTER 32. CYCLED GEAR SEVERAL TIMES, OPERATIONAL CHECKED GOOD. AIRCRAFT RETURNED TO SERVICE.