Need some help. Replaced foot control several years ago and unit had worked well until today. Drive head turns fine and could turn 360 degrees with no problem. The prop would not start up unless you would move the head different direction until it would kick in. As it got worst it would only run at the 180-220 degree position and eventually would not run at all. Drive motor still responds ok moving the head as it should. Took cover off head and verified the 2 heavy wires are ok. Could not see any problem with wires running to the board but no way to test any of the componets. Could this be a foot control issue ?? It acted like a frayed wire somewhere with the prob working when the head was in a certain position and then nothing. Appreciate any help. Thanks,