As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STL - FLT 447 - AFTER TAKEOFF, RT MLG RED LIGHT REMAINED ILLUMINATED AFTER LANDING GEAR RETRACTION. CYCLED LANDING GEAR. REPLACED LANDING GEAR POSITION AND WARNING ACCESSORY UNIT MFG PN 65-60211-95. LANDING GEAR POSITION AND WARNING LIGHT SYSTEM CHECKED NORMAL.