As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
THE AIRCRAFT WAS GROUNDED. THIRTY MINUTES AFTER DEPARTING PHX, RECEIVED EICAS MESSAGE NOSE A/G DISAGREE. THE FLIGHT RETURNED TO PHX AND DECLARED AN EMERGENCY. THE FLIGHT LANDED WITHOUT FURTHER INCIDENT. FOUND BROKEN WIRES FROM D40388J TO D41650P. REF NON ROUTINES REPLACED TWISTED PAIR PER SWPM 20-30-12. SYSTEM TESTS GOOD.