As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING POST FLIGHT. DURING POST FLIGHT PILOT NOTICED EXCESSIVE AMOUNT OF RESIDUAL OIL ON THE LEFT SIDE OF THE FUSELAGE, THE MECHANIC FOUND THE T/R HYDRAULIC RETURN LINE (B) NUT WAS CRACKED, HE REMOVED AND REPLACED THE LINE. AIRCRAFT WAS LEAK CHECKED AND RETURNED TO SERVICE.