As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON TAKEOFF, RIGHT MAIN GEAR RED ''A'' LIGHT REMAINED ON AND ALL GEAR CAME UP BUT ALL DOORS STAYED OPEN. NO CHANGE WHEN GEAR HANDLE WAS CYCLED. REMOVED AND REPLACED RIGHT HAND MAIN LANDING GEAR PROXIMITY SENSOR (''A'' DOWN AND ''A'' UP). OPS CHECK GOOD IAW MM 32-60-00. P/N ON UP120-41126-001, P/N ON DOWN120-41127-00.