As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
BUF-LGA - FLT 1731 - AFTER TAKEOFF AND LANDING GEAR RETRACTION THE LEFT GEAR INDICATED UNSAFE. THE AIRCRAFT RETURNED TO THE FIELD AND LANDED WITHOUT INCIDENT. MAINTENANCE FOUND THE LANDING GEARS COVERED WITH ICE SLUSH. ALL THREE LANDING GEAR WERE DEICED AND OPERATION NOW CHECKED NORMAL. (M)