oldsko0lSC

Hey guys, I've been browsing the forums alot but haven't post much. My SC300 never had a problem until now. It's a 2000 Lexus SC300. I had it since 2006 and it finally gave me a problem. It's getting hot here in California as the weather is warming up. Today my AC just stop working. I had a automotive shop check out the A/C System. They said a bunch of stuff and I didn't really understand it or trust them to do the repairs. Anyone know how to explain the readings on the A/C Pressure Gauge and tell me what is wrong? Pictures attached are Pressure readings with the A/C on.