As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MLG DISAGREE WITH EICAS MESSAGE, AFTER TAKEOFF. PERFORMED THE GEAR DISAGREE CHECKLIST AND RETURNED FOR LANDING. TROUBLESHOT IAW FIM 32-30-00-815-819. REPLACED SELECTOR VALVE AS PRECAUTION IAW MM 32-31-02-0 04-001. OPERATED LANDING GEARS ON JACKS. ALL SYS NORMAL AT TIME. LEAK CHECK AND OPS CHECK NORMAL.