As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 7511 IAD TO DFW ABOUT 25 MINUTES INTO THE FLIGHT THE CREW RECEIVED -HYD 2 LO QTY- EICAS MESSAGE. HYDRAULIC FLUID AT 20%, DECREASING TO BELOW 10%. CREW DIVERTED TO CMH. ABOUT 30 MILES FROM CMH, CREW RECEIVED -HYD 2 LO PRESS-, EICAS MESSAGE. THE FLUID QUANTITY DECREASED TO 0% AND THE PRESSURE WAS 0. CREW DECLARED AN EMERGENCY AND LANDED WITHOUT INCIDENT. MAINTENANCE REMOVED AND REPLACED THE NR 2 ENGINE DRIVEN HYDRAULIC PUMP.