sounds like its time to trace some wire bro. As screwed as it may sound its the only real way to make sure. I mean you can take a volt meter and test resistance in each wire on your service position button and that will give you a better idea as too which wire is failing or grounding, but in all reality I would just trace the group of them from the back of the button all the way to the fuse box and im sure you will find the problem. Feel free to pm if you have anymore questions. i will do what I can from here.
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Drifting it one corner at a time.
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