I have a 55lb thrust minn kota bow mount hand contol trolling motor which suddenly decided it doesn't want to really work. When I turn it on either forward or reverse (5 speeds) it will spin (out of the water). When it is in the water it spins super slowly no matter what speed it is on. I can pull the prop about an 1/8 of an inch away from the main housing on the lower unit. It seems to have water in the lower unit which I assume is supposed to be sealed. I know this because air bubbles come out between the prop and the lower unit when it goes back into the water. Any help would be appreciated.