What was found
AFTER GEAR RETRACTION THE GEAR DISAGREE R CAS MESSAGE CAME ON ALONG WITH A YELLOW X OVER THE RIGHT GEAR INDICATOR. RAN QRH AND ENDED UP BLOWING GEAR DOWN. SENT ARES DOWNLOAD FOR REVIEW. THE RESULTS SHOWED A FAILED SWITCH. WIRE HARNESS INSPECTION & WIRE CHECKED, NO DEFECTS NOTED. SERVICED AND RESET THE EMERGENCY GEAR EXTENSION PNEUMATIC BOTTLE. CYCLED GEAR 10 TIMES IAW AMM WITH NO FAULT. REMOVED DEFECTIVE RT MAIN DOWNLOCK SWITCH. INSTALLED A NEW SWITCH IAW AMM 32-30-15. C/W POST INSTALL OPS CHECKS, NO DEFECTS NOTED. OPS CHECK GOOD. INSTALLED SEALANT AROUND THE SWITCH HOUSING GAP IAW AMM: 20-40-20.