Kenmore Pro 48" Refrig Intermittent power outage

After opening the refrigerator door for about 3 seconds, the refrig unit loses all power; lights go out; gauges inop. Close the door and often the power will return and the refrig goes thru its startup sequence. If I leave it alone the power remains on no problem. Open the door and it goes out again. I was suspicious of the interior light or the door switch but the service rep says its the main circuit board for which I am waiting. Presently, the power will not come back no matter how much I open and close the door. So I've lost some money in groceries.