As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON GEAR RETRACTION, GEAR DOOR OPEN LIGHT REMAINED ILLUMINATED AFTER GEAR RETRACTION. GEAR WAS RECYCLED PER ABNORMALS AND GEAR DOOR OPEN LIGHT REMAINED ILLUMINATED WITH THE GEAR EXTENDED ALSO. REPLACED THE RIGHT MAIN LANDING GEAR DOOR SWITCH IAW DC-9 MM 32-60-03-02.