As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PIT - AFTER TAKEOFF, CREW RECEIVED LEFT AND RIGHT MAIN LANDING GEAR WARNING ON THE MFDU. THE GEAR WAS CYCLED WITH THE SAME RESULT. FLIGHT RETURNED TO PIT AND LANDED WITH NO FURTHER INCIDENT. MAINTENANCE FOUND THE LANDING GEAR TEST VALVE IN THE TEST POSITION. THE SWITCH WAS SAFETIED AND THE AIRCRAFT RELEASED FOR SERVICE. (M)