As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STL - FL 1254 - AFTER TAKEOFF FROM STL AND GEAR RETRACTION, CREW RECEIVED MFDU MESSAGE THAT THE LEFT LANDING GEAR WAS NOT UP. GEAR WAS CYCLED WITH THE SAME RESULT. FLIGHT RETURNED TO STL AND LANDED WITH NO FURTHER INCIDENT. AIRCRAFT WAS FERRIED TO PIT. MAINTENANCE CHECKED THE GEAR DOOR SWITCHES AND FOUND NO PROBLEMS. AIRCRAFT WAS JACKED AND GEAR SWUNG TEN TIMES WITH NO FAULTS. AIRCRAFT RELEASED FOR SERVICE. (M)