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Some key things removing the cover- three screws into floor. fortunately no drivers side forward.   After cutting the silicone caulk in seam from the  bathroom side, we wedged boards as recommended by richard. Key is not to tip it up too far on one end as it wedges itself in. loosen all corners then push straight up.

I cannot tell by looking if I have the valve keepers mentioned earlier.  Rollers look great,JakeBrake wires ok.
Thanks for the help .
JD

You have the newer style jakes and those are the (good) unitized adjusters, nothing to worry about!