As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SHORTLY AFTER AIRCRAFT DEPARTURE, THE PILOT SMELLED HYDRAULIC FLUID IN COCKPIT. DECISION WAS MADE TO DIVERT BACK TO AIRPORT. WHEN CYCLING GEAR DOWN, AN UNSAFE CONDITION WAS INDICATED AND GEAR WAS PLACED IN DOWN POSITION BY EMERGENCY PROCEDURES AND LANDED WITHOUT INCIDENT. UPON INSPECTION IT WAS DISCOVERED THAT THE TUBE ASSEMBLY IN THE NOSE WELL HAD CORRODED AT THE FORWARD ATTACH CLAMP AND HAD PRODUCED A HOLE, ALLOWING HYDRAUIC FLUID TO ESCAPE.