As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
APPROX 15 MINS AFTER TAKEOFF RECEIVED HYD 3 LOW PRESSURE CAUTION MESSAGE. SYS 3 DID REFLECT 0 FLUID. APPLIED QRIT PROCEDURES, RETURNED TO DEPARTURE. EMERGENCY DECLARED. R & R HYD SYS NR 3 FILTER PRESSURE MANIFOLD IAW AMM 29-12-09 OPS AND LEAK CHECKED GOOD. NO FURTHER SEFECTS NOTED AT THIS TIME.