Just bought a 1996 Sea Ray 175 BR, with 3.0LX 135 HP motor #OF782926Alpha one Gen. II out drive. I have had the boat out twice, and noticed it has been taking on water, yes the plug is in and no holes in the hull. I assume that water must be entering through the out drive. In reading forums here, sounds like bad Gimbal bellows. How is the best way to check this out, or other suggestions.