I have never done this particular operation but it does not look like you need to remove the compressor. Just remove that bolt in the middle and any hold downs on the manifold assembly and move it out far enough for access to the o-rings.

I would not touch the expansion valve o rings if they are not leaking. Rarely do you have a leak like that. The expansion valve will sometimes leak at the diaphragm on the end, but again, if it ain't broke, don't fix it.

Good luck,