What was found
RIGHT MLG LANDING GEAR EXTENSION: AFTER EXTENDING THE GEAR ON APPROACH, WE INITIALLY GOT A THREE-GREEN INDICATION, BUT AFTER ABOUT 30 SECONDS THE GEAR DISAGREE R CAS CAME ON. WE DIVERTED, SAME THING HAPPENED WHEN EXTENDING THE GEAR AT THE DIVERSION AIRPORT. WE BLEW THE GEAR DOWN AND LANDED WITHOUT INCIDENT.////SIGN-OFF DISCONNECTED THE HYDRAULIC MULE AND BURPED THE SYSTEM. HYDRAULIC FLUID RAN CLEAR WITH NO AIR PRESENT. SERVICED THE HYDRAULIC RESERVOIR. IAW CE0-680A AMM 32-34-00 AND 32-23-25. OPS CHECK GOOD.