I recently purchased this boat and have used it approx 10 outings. Today while attempting to shift into reverse it actually moved forward. In the neutral position, it is still in forward gear. The linkage seems to be working correctly when I shift the control but nothing other than forward is occurring. I have drained the oil in the lower unit. I did not find any chunks of metal on the magnet. The oil was kinda dark but not milky or full of water. Any help would be greatly appreciated.