As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
GEAR DISAGREE R AMBER CAS: ON GEAR RETRACTION THE AMBER CAS GEAR DISAGREE R DISPLAYED. THERE WAS AN ASSOCIATED AMBER X OVER THE GEAR POSITION INDICATOR. RAN THE QRH AND RETURNED TO LAND. PERFORMED THREE POINT JACKS. SWAPPED RT AND LT MLG DOWNLOCK SWITCH TO VERIFY IF THE GEAR DISAGREE R CAS MESSAGE TRANSFERED TO THE LH SIDE. REMOVED FAULTY RT MLG DOWNLOCK SWITCH. INSTALLED A NEW RT MLG DOWNLOCK SWITCH IAW AMM 32-30-15.