As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 9195, PIT-CLT - FOLLOWING TAKE-OFF THE CREW RECEIVED A LANDING GEAR "WEIGHT ON WHEEL" EICAS MESSAGE AFTER THE LANDING GEAR HANDLE WOULD NOT RAISE TO THE UP POSITION. THE FLIGHT RETURNED TO THE FIELD AND LANDED WITHOUT INCIDENT. MAINTENANCE SERVICED THE NOSE LANDING GEAR STRUT.