As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CLIMB, PASSING THRU APPROXIMATELY FL 280, RECEIVED A YELLOW CAUTION MESSAGE HYD 2 LOW PRESSURE WARNING. AFTER RUNNING APPROPRIATE CHECK LISTS, DETERMINED TO RETURN TO DEPARTURE. DECLARED THE EMERGENCY. LANDING WAS UNEVENTFUL, ALL SYSTEMS FUNCTIONED AS NECESSARY, SYSTEM PRESSURE NEVER GOT BELOW 3000PSI.