[Porsche 935]

I fixed my a/c in my Carrera this year, all new lines. But have an issue with my S2000. Wondering if someone can help. Pressures were way off and I replaced the receiver dryer. All was good, but stopped working again. I have no history on car but a/c stopped blowing cold again. Do these pressures look like the dryer is clogged again or the expansion valve is bad. The lower pressure is at idle, the higher is when engine us is revved.