Cm870 tuning issue needs some help

[Sledpuller]

We are having an issue getting the Ecm to load a tune. It’s failing at 70% every time preparing to load the tune. We have tried loading with a bench harness with same result. Truck is a 2004 Mack cl733 with 565 cm870.
I’m using a new nexiq 3 usb wired. I’m working with very helpful and recommend tuner from here. I know it’s possible the Ecm is toast. But just want to make sure before I purchase new one from cummins ($2600).

I have a friend from cummins I’m meeting tomorrow to see if he can load a stock file on it with his laptop and software.

Truck is stuck at my house dead in the water.

Any help is greatly appreciated. Would really like to get back to work Monday.
Thanks