Any on line help for repairing e-units

One of my PW steamers has developed a problem with the e-unit, it is stuck in reverse. Rather than take it to my LHS for repair I thought I might try myself. Are there any on line instructions with pictures or videos available that would help me out? If not can anyone recommend a book that I could use? Thanks in advance.

Bruce

Try cleaning it with tuner. If not, you need 12 fingers on each hand and three hands. [:O][banghead] I’ve done it but not my favorite task. One thing is to observe and see if the plunger is moving up and down If not, check for loose wires feeding power to the unit. If plunger moves, is it turning the cylinder where the fingers touch? Bob Nelson is great at fixing these EUnit problems. Hope he will pop in and advise. Good luck.

Try http://pictures.olsenstoy.com/searchcd31.htm?itm=1070