As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTED LOSS OF NR 2 HYDRAULIC CONTENTS AFTER TAKE OFF. HYDRAULIC ISOLATION VALVE LIGHT ILLUMINATED. EMERGENCY WAS DECLARED, AND AIRCRAFT RETURNED TO FIELD WITHOUT FURTHER INCIDENT. MAINTENANCE REPLACED A HYDRAULIC FLEX LINE AT THE NOSE GEAR DRAG STRUT ACTUATOR. AIRCRAFT RETURNED TO SERVICE.