CM871 poor power and fuel econ

[Grounded Pilot]

The only access I have to the ecm is through a ScanGuage D unit I have in the truck. Is there a way I can still copy the software file to my laptop? And I don’t know if the mechanic will do that for me.

Both metering actuators and timing actuators have been replaced with Cummins oem or reman actuators in the last 2,500 miles. And the cut off solenoid a couple days ago. (Can they go bad that quick? Or could I have a bad o-ring on the reman units? There is no fuel leaking from anywhere I can find though) That’s why the mechanic is thinking cracked housing. And I don’t believe they did the individual leak down test. And he said it passed the cylinder cutout tests.

I will be back out to my shop in a little bit and I can do more testing on it. But I feel like I’m throwing darts in the dark at the moment!