What was found
ENTERED DOWNWIND FOR VISUAL APPROACH AT BFF. GEAR LEVER DOWN, 2 GREEN (MAINS) 1 RED (NOSE) HYDR CAWS LIGHT ILLUMINATED. ABORTED APPROACH, CLIMBED TO SAFE ALTITUDE AND RAN THE HYDR EMERGENCY CHECKLIST. WAS ABLE TO GET 3 GREEN AND RETURNED TO APA WITH THE GEAR DOWN. ( CORRECTIVE ACTION ) REMOVED HIGH CURRENT RELAY PN: 974.09.26.112 SN: 478 WITH NEW RELAY PN: 974.09.26.112 SN: 2906 AND PERFORMED EXTENSION AND RETRACTION OF LANDING GEAR REFERENCING PC12 AMM 12-A-24-00-00A-901A-A. FUNCTION TEST GOOD. PERFORMED OPERATIONAL CHECK FLIGHT WITH NO DISCREPANCY'S NOTED.