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I got the car back from the repair shop with a new ECM in it. It appears to be operating OK, but I'm holding final judgement until I can operate it in the conditions that caused the failures before.
I did keep the ECM they removed. I want to open it to check the boards. It appears to be easy to do, the lid is held in place by four torx screws but it also has what appears to be a thin layer of silicon as a gasket to keep crud from the inside. That stuff is tougher than glue. Any suggestions of how to pry the lid off without bending the crap out of it?
I suggest that you not try to open it until you are convinced that the new ECM solves your problem. If not, the old ECM may be perfectly OK. When you do decide to open the ECM, the tutorials I've seen online suggest using a heat gun to soften the gasket material:
Quick update to thread. The car has been operating OK since I got it back. I intentionally have driven on as hot a day as we've had 105, with A/C on, radio on, etc. I drove for 25 miles, parked in the sun for an hour, drove some more. It appears the new ECM fixed the issue. Thanks for all the suggestions from the members.