As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ALTERNATE GEAR EXTENSION DOOR WILL NOT OPEN ALL THE WAY ON GROUND DURING PRE-FLIGHT. FERRIED AIRCRAFT FOR REPAIRS. REPLACED SECONDARY MLG SELECTOR VALVE IAW AMM 29-21-06-000-801, 29-21-400-801 AND HS 29-0009, ALL CHECKS GOOD. ALTERNATE EXTENSION DOOR OPENS AND CLOSES FREELY AND OPENS "ALL THE WAY". RETURNED TO SERVICE.