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Thanks Terry, sounds like great methodology. I'd like to start by just getting the cover off to take a look, that's the part holding me up. If I can't get beyond the cover, it's no use cutting and marking wires. 

I may not have explained adequately, I've attached a top and bottom pic of the chassis. It is floating between the two front supports in rubber and one bracket on the back. When I removed the aft bracket, the tuner was free to mover about 3/8ths of an inch, but not enough to move it up or down. 

There are three nuts located on top,  along with some trimmers, but they don't appear to be structural, more like holding a component inside. Not sure I want to try them. I'm a bit stumped!