As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING TAKEOFF THE FLIGHT CREW RETRACTED THE LANDING GEAR BUT GOT A LANDING GEAR AIR/GND FAIL MESSAGE AND THE LANDING GEAR WOULD NOT RETRACT. AIRCRAFT RETURNED TO STL. MAINTENANCE INSPECTED AND REMOVED AND REPLACED THE RIGHT WOW PROX SWITCH AND THE LEFT MAIN DOWNLOCK PROX SWITCH. LANDING GEAR OPS CHECKED GOOD.