I have a crown sit-down forklift 50FCTT-188 (year 2001 or 2004) 48 volts system. The lift has 4500 hours and was in good working order. One day we cleaned the lift with pressure washer to remove any buildup acid and dirt. We did over spry the motor and the battery compartment. After that the lift does not want to move (the hoist still works fine). I have an error message "71" when put on drive or reverse. I did dry the lift very well (from any water) and let it sit for few months with no results. Any one knows what code 71 means and how to fix the problem. Thanks very much for the help.