What was found
ON DEPARTURE, PILOT NOTICED THE MAIN LANDING GEAR DID NOT RETRACT. TWO ATTEMPTS TO RETRACT THE GEAR WITHOUT SUCCESS. PILOT NOTED HE HAD THREE GREEN DOWN AND LOCKED LIGHTS CONTINUOUSLY. TOWER SUGGESTED A LOW FLYBY TO CONFIRM THREE DOWN AND LOCKED. CREW COMPLIED, AND COMPLETED A NON-EVENTFUL LANDING. TROUBLESHOT AND DETERMINED THAT THE TWO SWITCHES THAT ARE ACTIVATED BY THE LARGE GEAR RETRACT - EXTEND SWITCH WERE FAULTY AND NOT PROVIDING THE CORRECT VOLTAGE TO THE SYSTEM. THEY ARE CURRENTLY BEING REPLACED.