As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON FLIGHT 3942 CREW REPORTED AT 22,000 FT .77 MACH GEAR UNSAFE MSG ON EICAS. GEAR DOOR OPEN. CREW DECLARED EMERGENCY INTO ORD AND LANDED WITHOUT INCIDENT. ACFT REMOVED FROM SERVICE. C/A REPLACED NLG DOOR SOLENOID VALVE. IAW EMB 145 AMM 32-33-02. OPS CHECK GOOD. ACFT RETURNED TO SERVICE.