Thermador display is very dim

Hi and help please: I have read everything on the entire web and also this site to try a home fix on the dim temperature readout that everyone has had luck doing on the cheap. I have a 12 year old thermador double electric wall oven. My local appliance store now wants $680 to do this. I have the front of the oven off and am trying to remove the board. However, the wire connectors seem to be stuck. I cannot pull them off the board without risking breaking the wires or the board. There are 101 separate wires each with their own connector! and only a few of them come off easily. Each post talks about easily getting the board off so I must be missing something.Any insight into how to loosen the connection?