What was found
EN ROUTE FROM PDX TO TOL, THE LANDING GEAR DOOR AND GEAR UNSAFE WARNING LIGHTS ILLUMINATED AFTER GEAR RETRACTION. THE FLIGHT CREW CYCLED THE GEAR, PERFORMED AN UNSUCCESSFUL GEAR UP LATCH CHECK, THE WARNING INDICATIONS REMAINING THE SAME. THE FLIGHT RETURNED TO PDX FOR AN UNEVENTFUL LANDING. MAINTENANCE INSPECTED THE AIRCRAFT, ADJUSTED THE LEFT MAIN GEAR ACTUATOR IN ACCORDANCE WITH THE MAINTENANCE MANUAL. MAINTENANCE PERFORMED A SUCCESSFUL OPERATIONAL CHECK. THE AIRCRAFT WAS RETURNED TO SERVICE.