As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
EWR-PIT - FLT 557 - AFTER TAKEOFF, THE NOSE LANDING GEAR RED INDICATION LIGHT REMAINED ON AND THE NOSE LANDING GEAR RETRACTED INDICATION PIN WAS NOT VISIBLE. THE LANDING GEAR WAS EXTENDED AND THE AIRCRAFT DIVERTED TO LGA AND LANDED WITHOUT INCIDENT. MAINTENANCE SERVICED THE NOSE LANDING GEAR STRUT AND REPLACED THE SCHRADER VALVE AS PRECAUTION. (M)