As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 3191 PHL-GSO UPON DEPARTURE FROM PHL, RECEIVED HYD 1 LO QTY ON EICAS WHEN THE GEAR WAS RETRACTED. RAN QRH. DURING CRUISE, E1 HYD PUMP FAIL AND EVENTUALLY HYD SYS FAIL APPEARED ON EICAS. RAN QRH AGAIN. COORDINATED WITH DISPATCH AND MAINTENANCE OVER ATLANTA RADIO AND DECLARED AN EMERGENCY. CONTINUED ONTO GSO. LANDED WITHOUT INCIDENT. MAINTENANCE REMOVED AND REPLACED ENGINE DRIVEN PUMP IAW EMB 145 MM 29-10-03. OPS CHECK GOOD. LEAK CHECK GOOD. NO LEAKS FOUND AT THIS TIME.