As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
MSO - ON PREFLIGHT, FOUND LANDING GEAR ALTERNATE EXTENSION DOOR WOULD NOT FULLY OPEN. OPERATIONAL CHECK DOOR, DOOR OPENS COMPLETELY. NO FAULTS NOTED. LATER AS FOLLOW-UP TO FBO ACTION, REMOVED AND REPLACED SECONDARY MLG SELECTOR VALVE IAW MM TASK NR 29-21-06-000-801 AND NR 29-21-06-400-801. RIGGED VALVE IAW MM TASK NR 29-21-06-830-801. OPS AND LEAK CHECKS GOOD. RETURNED TO SERVICE.