Unless it has been fitted by a previous owner there should be no electric water pump below the engine bilge tray, the engine tray moulding is bonded directly on the hull, The wires and pipes you describe are part of the wiring loom and plumbing system that are routed at the side of the water tank, the ball bearings (if they are approx 3-5mm) you see are just remnants of the shot ballast used in the construction process.