As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PIT - FLT 48 - DURING CLIMB OUT OF PIT, CREW RECEIVED THE EICAS MESSAGE 'GEAR DOORS'. FLIGHT RETURNED TO PIT AND LANDED WITH NO FURTHER INCIDENT. AIRCRAFT WAS FERRIED TO CLT. MAINTENANCE FOUND THE SYSTEM 1 RIGHT NOSE GEAR DOOR P2 CLOSED SENSOR (S235) GAP EXCEEDING THE MM LIMITS AND ADJUSTED IT. GEAR WAS SWUNG TO VERIFY OPERATION. (X)