As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
UPON APPROACH INTO LGA NOSE DIAGREE MESSAGE ON EICAS, NOSE GEAR FAILED TO EXTEND NORMALLY. A/C DIVERTED TO SWF WHERE EMERGENCY GEAR HANDLE WAS PULLED. A/C LANDED WITH OUT INCIDENT. LANDING GEAR WAS PINNED AND MAINTENANCE FERRIED TO RDU. TROUBLSHOOTING INDICATED NOSE LANDING GEAR SELECTOR TO BE FAULTY. REMOVED AND REPLACED NOSE LANDING GEAR SELECTOR VALVE IAW CL-65 AMM 32-33-10. JACKED NOSE GEAR, SWUNG NOSE GEAR SEVERAL TIMES AND NO FAULTS NOTED.