Upon arrival started checking over system and found once of the connections was leaking against. Tightened it up and got it to stop leaking. Pressurized system to 375psi and held for 25 mins. Pulled vacuum of 103 microns. Added 5lbs 7.7 oz (system called for 5lbs 7.3oz. Made sure everything was tight and stared system. Started getting code PC04 again on head unit. Called customer but he was on a conference call. He gave me a number for the tech support so I called with no answer so I left a message with my number and all to call back.