Today my 225 optimax wouldn't shift into drive. The engine revved as I pushed the handle forward so the cable that controls speed seems to work. I'm hoping the problem is in the shift handle at the console but I'm having trouble figuring out how to get the cable box out. Are there step by step instructions anywhere online that I can refer to? The crazy thing is I have a $50 maintenance manual that doesn't have any information about the shift cable.