I have a Clark TM20 with an LX panel. It has a drive cutout problem accompanied by a code -10. During loss of drive, the directional contactors drop out; intermittently at first as though there's a loose connection, then within minutes the dropout is steady and the code appears on the display. Everything seems to be in place, and I removed the control card and placed it in an identical truck to see if the problem followed the card. It did not. The previous tech who observed this problem also mentioned a code -33 coming up. I cannot find these codes in any of the EV100 books I have. All help would be appreciated.