As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
HPN-BWI FLIGHT#3595. CREW REPORTED #1 HYDRAULIC QUANTITY INDICATION DOWN TO 3/4 QT. IN FLIGHT. #1 ISOLATION VALVE AND ROLL SPOILER INBOARD CAUTION LIGHTS ILLUMINATED. MAINTENANCE REPLACED SPOILER HYDRAULIC LINE. GROUND RAN AIRCRAFT, NO LEAKS NOTED. AIRCRAFT RETURNED TO SERVICE.