As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PIT - FL 1749 - LEFT MAIN GEAR RED LIGHT REMAINED ILLUMINATED WHEN GEAR SELECTED UP. CYCLED GEAR AND BOTH MAIN GEAR RED LIGHTS ILLUMINATED ALONG WITH BOTH MAIN GEAR DOOR YELLOW LIGHTS. FLIGHT RETURNED TO PIT WITH NO FURTHER INCIDENTS. MAINTENANCE ADJUSTED THE LANDING GEAR DOOR UPLOCK SWITCHES. (M)