As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
LANDING GEAR WILL NOT EXTENED IN FLT. USED ALTERNATE EXTENSION, A/C SAFETY LANDING. AFTER CHECKING LANDING SYS, FOUND LANDING GEAR SELECTOR VALVE MALFUNCTIONED. REPLACED SELECTOR VALVE AND PERFORMED LANDING GEAR RETRACTION AND EXTENSION OPERATIONAL CHECKED NORMAL.