John, that was the plan but since this seemed to be a mechanical issue I gave it one more shot last night. I disconnected the board and looked at how the working connector performed and how the non working connector did not. Then I manually moved the non working one with my tool that looks like a dental pick. That movement freed it from whatever was binding it. All connections are now firm, board had been re-installed and functioning properly. I have no idea why this one connection was stuck but the outcome if positive. Thanks to all for the responses, I'm on to my next 2 conversions with AC commanders. A new challenge.