What was found
AFTER TAKEOFF, RT MAIN LANDING GEAR UNSAFE LIGHT REMAINED ILLUMINATED. AFTER SECOND RECYCLE, LIGHT WENT OUT. *S/D* REPLACED RIGHT MAIN LANDING GEAR WARNING SWITCH. CHECKED SECURITY OF ALL ATTACHMENTS AND COMPONENTS. RAN LANDING GEAR THROUGH 15 CYCLES IAW DC9 MM 32-61-01, NO DEFECTS NOTED.