What was found
EN ROUTE FROM TOL TO BDL, THE LANDING GEAR AND DOOR UNSAFE WARNING LIGHTS REMAINED ILLUMINATED AFTER GEAR RETRACTION. THE FLIGHT CREW CYCLED THE LANDING GEAR BUT THE UNSAFE WARNING INDICATION REMAINED THE SAME. THE FLIGHT RETURNED TO TOL FOR AND UNEVENTFUL LANDING. MAINTENANCE INSPECTED THE AIRCRAFT WHICH REVEALED THE LEFT MAIN LANDING GEAR RETRACT PIN BOSS CRACK. MAINTENANCE REPLACED THE LEFT LANDING GEAR UPPER STRUT CYLINDER IN ACCORDANCE WITH THE MAINTENANCE MANUAL AND PERFORMED A SUCCEFUL OPERATIONAL CHECK. THE AIRCRAFT WAS RETURNED TO SERVICE.