As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ACFT EN ROUTE FROM EWR TO TYS WHEN THE HYD 1 SYSTEM MESSAGE WAS HYD LOW QUANTITY. MAINTENANCE REMOVED AND REPLACED THE NR 1 ENG DRIVEN HYD PUMP IAW EMB 145AMM 29-10-03 AND REMOVED AND REPLACED THE NR 1 ELECTRIC DRIVEN PUMP IAW EMB 145 AMM 29-10-04. OPS AND LEAK CHECKS WERE GOOD AND WAS RELEASED AFTER A SERVICE ROUTINE WAS COMPLIED WITH. P/N FOR ELECTRIC DRIVEN HYD PUMP (971533, S/N MX683545). (S)