As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
GEAR UPLATCH CHECK FAILED WHEN GEAR HANDLE WAS PLACED IN UPLATCH POSITION. NOSE GEAR UNSAFE LIGHT CAME ON. GEAR WAS RECYCLED TWICE. RIGHT GEAR UNSAFE LIGHT REMAINED ON. VERIFIED ALL CLEARANCES, CLEANED CANNON PLUG, REPLACED SENSOR CONTROL BOX AND OPS CHECKED IAW DC9 MM.