As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PIT - BOS - FLT 564 - AFTER TAKEOFF, THE LANDING GEAR HANDLE WAS PLACED IN THE UP POSITION. THE MAIN GEAR RETRACTED BUT THE NOSE GEAR UNSAFE LIGHT ILLUMINATED ALONG WITH VIBRATION. THE AIRCRAFT RETURNED TO THE FIELD AND LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED AND LUBED THE NOSE GEAR. THE GEAR WAS SWUNG SEVERAL TIMES, ALL INDICATIONS AND OPERATION WAS NORMAL. (M)