What was found
CREW REPORTED FLIGHT CONTROL B SYS HYD OVERHEAD LIGHT ON FOLLOWED QRH TURNED ON STDBY RUDDER ADDING WHAT CREW SENT IN ON E-MAIL ,ON DEPARTURE MASTER CAUTION ILLUMINATED WITH FLT CONT LIGHT AND LOW PRESSURE LIGHT ON OVERHEAD PANEL ON FLT CONT B SIDE. FLYING PILOT REPORTED THE AIRCRAFT BANKED RIGHT OF CENTERLINE DURING TAKEOFF AND NEEDED TO BE CORRECTED WITH OPPOSITE AILERON INPUT. AFTER THE CHECKLIST WAS RUN, 4 UNITS RUDDER TRIM WAS REQUIRED DURING THE FLIGHT TO MAINTAIN COURSE. REPLACED SYSTEM B FLIGHT CONTROL HYDRAULIC MODULE PER AMM 27-09-21-400-801.NO OVERHEAD LIGHT INDICATIONS NOTED.NO LEAKS WERE FOUND AND OPS CHECKED GOOD PER AMM 27-09-21-700-801.