I don't mean to jump in but Just in case your not sure where the tuner is, with the front of you box facing you the tuner is on the far left hand side, there are two metalic box's of similer size with a third larger metalic box attched by connectors, remove this by pulling it out of the connectors and remove the cover under there you will find the area that Knosher has indicated on the thumbnail. Hope this helps, i had the same problem looking all over the board until it was pointed out to me that the track was inside the tuner.