As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
GEAR WOULD NOT EXTEND WITH GEAR SELECTOR IN DOWN POSITION, HAD TO USE EMERGENCY GEAR EXTENSION. FOUND O-RING LEAKING ON RIGHT FILTER HOUSING. REPLACED BOTH LT AND RT FILTER HOUSING O-RINGS. SERVICED HYD FLUID. OPS CHECK ON GROUND SATISFACTORY.