Pheonix ultra fresh 2 coding out during defrost

Hey everyone. Im new to this group, but i have a question. I have a 99 utility with a 99 carrier pheonix ultra fresh 2 unit. Ive only had a year. Havent reslly had any issues until now. I had a compressor shaft seal put in in December. This past week I was getting loaded and my unit coded out with a "high pressure" code during the defrost cycle. It cools fine. It started off doing it every time, now it only does it every 3 or 4 defrost cycles. I took it to 2 carrier dealers on my way in to NC from ATL and nothing they suggested worked. I know they really want to get me on the clock and charge me like they are going out of business, but i figured id try and get some advice else before hand. Can anyone help??