As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMBOUT A RED GEAR UNSAFE LIGHT ILLUMINATED FOR THE RIGHT MAIN LANDING GEAR. THE CREW COMPLIED WITH THE ABNORMAL CHECKLIST AND CONTINUED OPERATIONS. MAINTENANCE INSPECTED AND FOUND THE RIGHT MAIN LANDING GEAR DOWNLOCK SWITCH TO BE STICKING. MAINTENANCE REPLACED THE SWITCH IAW DC-9 MM 32-60-80.