I'm not sure if it's been a long time in happening, or if I finally just noticed it last night, but the hot/cold mix switch on my SR5 (not the auto climate control) feels like whatever it controls behind there is getting some slack. I haven't torn apart the dash in this rig, but I'm assuming it's going to be similar to my '86... are there just cables back there that I can tighten up? And if so, where is the best place to do that? In the dash or under the hood somewhere?