Prius (Gen 2) :: AC Blowing Cold On Passenger And Warm On Driver Side

I bought this 06 Prius in April and it has been a nightmare. I have an 05 and thought "I love this car so much, I want another!". I didn't do a good job inspecting the car before I got it, but oh well. Here we are at the dealership because my Driver side AC was blowing warm and the passenger side was nice and cool. $300 later, they call me up and say they have drained all the Freon because theres an obstruction causing the pressure on the high side to get so high that the compressor purge valve has to kick in and their AC machine shut off to protect the car.

He said it would cost 1700 to replace the Expansion Valve and the Receiver Drier, and that they weren't positive that would fix the issue, but that its the first step before replacing the Compressor. He said normally they'd suspect the compressor is going out, but he said it appears to be operating okay. Their opinion was that there is an obstruction in the line - most likely some sort of metal - which is causing the obstruction and the pressure on the high side to go to extreme levels.

Pressure on the low side he said was okay.

Here is the text from the service receipt:
Performed A/C inspection and all vents appear to operate fine. No leaks seen. Lots of debris in front of the condenser. Suspect system low on Freon. Perform evac and recharge. Installed dye.
Pressures:
High: 130psi
Low: 15psi

Used 1.1lbs of freon then noticed the restriction. Removed freon. recommend replace expansion valve receiver dryer, flush lines and replace all necessary o rings.