Our 1995 Johnson 115 HP outboard no longer has a reverse or neutral position. The motor runs fine in forward, produces no unusual noises, has full power. When placed in Neutral, it crawls ahead as if it's in forward gear at idle. Pull the control back to reverse, and it move forward, with even, smooth acceleration, as if the control is pushed the opposite way. Does anyone have any idea what may have happened? Sounds like an electrical/control problem, not a gearbox problem? Any help will be appreciated. Thanks