What was found
WHEN SELECTING GEAR DOWN ON FINAL APPROACH HYD CAUTION LIGHT CAME ON AND ONLY THE NOSE GEAR GREEN LIGHT CAME ON. HYD PSI WAS CLOSE TO ZERO, RUN EMERGENCY CHECKLIST, GOT ALL THREE GEAR GREEN LIGHTS DURING PROCEDURES. RAI HYD PUMP, OPS CHECK GOOD. RETURNED AIRCRAFT TO SERVICE. (M)