What was found
DURING A SCHEDULED FLIGHT FROM EWR TO BHM (FLT 2674), THE AIRCRAFT WAS DIVERTED INTO TYS FOR AN EMERGENCY LANDING. THE CREW REPORTED HYD NR 1 LOW LEVEL. MAINTENANCE FOUND THE REFILL CAP LOOSE AND SERVICED THE SYSTEM IAW-EMB-145-AMM-12-13-01. FOUND RETURN FILTER BYPASS INDICATOR POPPED, CHANGED FILTER AND O-RINGS IAW-EMB-145-AMM-29-10-08. THE AIRCRAFT WAS RELEASED FOR TEST FLIGHT. TEST FLIGHT SATISFACTORY, AIRCRAFT RELEASED TO SERVICE.