I'd say at bare minimum you're going to have to remove the top and bottom to access all the pots and switches.
This post suggests removing the faceplate as well. I'd recommend making a lengthened spray straw (tape two end to end) to get where it is needed. Deoxit D5 for switches. Deoxit Faderlube for pots.
This borrowed image shows just a touch of the switches under the light assembly.