As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ORF TO IAD - UPON DEPARTURE FROM ORF, THE LANDING GEAR WAS SELECTED UP, BUT WOULD NOT RETRACT. THIS WAS ACCOMPANIED BY AN LG AIR/GRD FAIL MESSAGE ON EICAS. THE AIRCRAFT RETURNED TO FIELD AND LANDED WITHOUT INCIDENT. MAINTENANCE INSPECTED ALL THE WEIGHT ON WHEELS SWITCHES AND THE TARGETS AND FOUND NO DEFECTS. THE AIRCRAFT WAS THEN TAKEN ON A TEST FLIGHT AND HAD NO FURTHER PROBLEMS.