George,
Remove the coupe seat cushion, then the adjusting knob needs to be removed; large slot screw on the front face of the knob pull the knob toward the firewall. The large adjusting screw is easily seen and removed by turning it so that it backs out toward the rear of the car; there should be a thrust washer on the front face of the screw. There should be twelve flat head screws, six on each side that need to be removed. With your paint guards in place and the aid of a helper, lift the seat, lean it forward some and pull it out through the passenger side. And no, the package tray doesn't have to be removed. The seat is heavy as I am sure you already know. You should then be able to look in and see the regulator mechanism. Lubriplate should work well on this. Let me know how it goes.
Chet
Let me know