So I finally mostly solved this problem but I don't especially understand it. I was having a lamp matrix issue on my JD in that I was getting double or triple lamps coming on in the single lamp test. The suspect lamps were always in column 7, and some in row 8 too. So aha I figured that I must have a blown TP107 in column 7 and TP102 in row 8. Except I didn't. (Scratches head). I finally do what they tell you to do to begin with and read the manual. I'm looking at all the connectors and get to J136. Says no connection. Hmm, then why do I have something connected there ? Pulled what was connected there and problem (mostly) fixed. Now I just have lamp 76 and 78 out though they appear to be working if testing directly with a lamp and diode at the J133 and J137 connector directly. Must have some open connection somewhere. With that preamble, here is the question. If J136 is supposed to be not used the a) why the heck is there something right there that looks like it's supposed to plug in there and b) if that connector doesn't plug in there then where does it go ? Based on the connector colors seems like it is supposed to perhaps go to the start button (yellow grey and red grey). And I still don't understand why that should cause my lamp matrix in column 7 to go haywire. Odd. Hoping someone smarter than me can explain this