Had a tech come here to try and rip us off. He was trying to charge us 850$ for a part that's 130$ retail to consumer so whats with the 720$ markup? Called the main office to get the crook out of our house and they still charged us with the diagnostic fee and offered no "real" price to have my system fixed. It's ok though for anyone with some common sense the board is really easy to fix. Save yourself some money and if your unit stops working try changing the board first.
Other places charge around 300$ for similar service to just change the board. Be warned when they try to rip you off!! Be an educated consumer.