As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RETRACTED THE LANDING GEAR AFTER TAKEOFF. RIGHT MAIN LANDING GEAR UNSAFE LIGHT ILLUMINATED. RECYCLED THE LANDING GEAR AND ALL INDICATIONS NORMAL. ALL INDICATIONS WERE NORMAL WHEN THE LANDING GEAR WAS LOWERED FOR LANDING. CLEANED GEAR INDICATION SWITCHES AND PERFORMED GEAR SWING IAW DC-9 M.M. 7-11-07 AND 32-00.