As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIR TURNBACK, HYD FUMES IN COCKPIT AND CABIN. REMOVED AND REPLACED A-SYSTEM RESERVOIR AIR PRESS REGULATOR AIR SUPPLY FILTER. REMOVED AND REPLACED RESERVOIR RELIEF VALVE. REMOVED AND REPLACED WATER SEPARATOR SOCKS ON BOTH SIDES. OPERATED SYSTEM PER MM. NO FUMES NOTED.