[lcaillo]

It is unlikely that the part is unavailable. He probably tried to order the whole board, where repairing it would be the typical procedure. It is possible to need a board if you had a coolant leak, but most can be repaired. You should get a detailed estimate from the servicer who provided the estimate, including what part he is having trouble getting and how he diagnosed the problem. Go to the Mitsubishi site and find the local ASCs in your area and start with them when looking for a good servicer. Read the sticky threads in this forum for some god info.