What was found
HYDRAULIC BLUE LOW PRESSURE ECAM, FELT A THUMP IN AIRFRAME, FOLLOWED BY A VIBERATION. R & R THE BLUE HYDRAULIC PUMP IAW AMM 29-12-51, OPS CHECKED GOOD. NO LEAKS. R & R THE HYDRAULIC PRESSURE SWITCH IAW 29-12-17, OPS CHECKED GOOD, NO LEAKS.