As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ISSUE-CREW REPORTED LANDING GEAR WOULD NOT COME UP AFTER TAKE OFF. LG AIR/GND FAIL EICAS MESSAGE DISPLAYED. FOLLOWED QRH. UPON TOUCHDOWN, MESSAGE CLEARED. CORR ACTION- MX TROUBLESHOT TO FAILED NLG PROX SWITCH R&R'D SWITCH AND ALL OPS TESTS/GEAR SWINGS CHECKED GOOD.