As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON ARRIVAL, CAPTAIN ADVISED DISPATCH THAT YELLOW HYDRAULIC RESERVOIR LOW LEVEL ILLUMINATED AND CONFIRMED INDICATION. EMERGENCY DECLARED, LANDED WITHOUT INCIDENT.AIRCRAFT WAS GROUNDED. MAINTENANCE FOUND LOOSE NUT ON YELLOW HYDRAULIC POWER MANIFOLD. THIGHTENED NUT. SERVICED YELLOW HYDRAULIC LEVEL TO FULL.AND ACCOMPLISCHED SATISFACTORY OPERATIONAL CHECK.