Anyone ever get this error? in the book says replace "vent valve" but i'm lookin in the parts manual and lookin for the location of it or what peice to replace and can't find it. other suggestion is replace LP955 or LP956 tnx in advance

The vent valve is the small black box type valve made by Kuhnke, and if memory serves me it has to be soldered to the board. I had to replace one for that error several years ago.