What was found
DURING VISUAL APPROACH INTO APA, WHEN MLG HANDLE SELECTED DOWN, RT MLG PRESENTED A YELLOW X & CAS MESSAGE MLG DISAGREE RT ILLUMINATED. RAN CHECKLIST, PULLED BLOWDOWN & MLG UPLOCK RELEASE. CONDITION REMAINED. TOWER VERIFIED ON A LOW APPROACH THAT ALL 3 MLG VISIBLE & A RETURN FOR LANDING WAS MADE WITHOUT INCIDENT. MLG AURAL WARNING CONTINUED FROM FLAPS SELECTED FULL THRU LANDING & UNTIL ACFT SHUTDOWN. JACKED ACFT, PERFORMED T/S & FOUND A FAULTY, INTERMITTENT RT UPLOCK SWITCH. REPLACED RT MLG UP-LOCK SWITCH ASSY, OPS CHECKED GOOD IAW MM 32-32-25, 32-32-00, 7-10-10.