As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BOS-BGR - FLT 4796 - ON APPROACH, THE LANDING GEAR WOULD NOT EXTEND WHEN SELECTED. FOLLOWING THEIR CHECKLIST, THE CREW PERFORMED AN EMERGENCY GEAR EXTENSION AND LANDED WITHOUT INCIDENT. MAINTENANCE FOUND THE LANDING GEAR CONTROL VALVE AT FAULT. THE CONTROL VALVE AND THE LANDING GEAR EXPLOSIVE BOLTS WERE REPLACED. AFTER PERFORMING ALL REQUIRED CHECKS THE AIRCRAFT WAS RETURNED TO SERVICE. (M)