What was found
UPON EXTENDING THE LANDING GEAR FOR LANDING AT KAAT THE LEFT MAIN INDICATION LIGHT WAS RED. I CYCLED THE GEAR WITH THE SAME RESULT. I THEN EXTENDED THE EMERGENCY GEAR EXTENSION LEVER BUT WAS UNABLE TO ADD ANY ADDITIONAL PRESSURE. I THEN NOTICED THAT THE LEFT MAIN GEAR LIGHT HAD TURNED GREEN. AT THIS POINT WE ABORTED OUR LANDING AT KAAT AND RETURNED TO KRNO WITH THE GEAR DOWN. PERFORMED EXTENSION AND RETRACTION FAULT ISOLATION PER PILATUS AMM 12-A-32-30-00-00A-420A-A. NO DISCREPANCY'S NOTED. PERFORMED OPERATIONAL CHECK FLIGHT, NO FAULTS NOTED AT THIS TIME.