Eaton RTO16910B-DM3 issues with wire and air

Hey all! This transmission sits in a 2007 international 9400i with a cat15. It has been throwing a code 35, while I’m working on testing the wiring harness for resistance and voltage, an odd thing has me perplexed.
I have an air leak. Cant figure out where it’s coming from… most likely from the parking brake release buttons. However… the push button auto shifter has a 13 pin wire harness connected to it. And when I pull it out, the air leak stops. Plug it back in and the air leak starts again. It’s been going on for a while now. But this electrical wire harness has no air to it. So why is the air leaking while it’s plugged in. My mechanic and tranny mechanic are baffled with this. Anyone come across this issue? Please help me understand why air leaks and stops due to an electrical wire harness…

 

Thanks for a quick reply. I have the same booklet and printed the parts for testing voltage and resistance... the mechanic will test the 38pin and diagnostic port as i can't get to it, which will give me more details on if the data link on wire harness is faulty. i measured across the data link on my 6 pin diagnostic port and the resistance was 891 ohms, which far exceeds eaton specs. The voltage on each data link pin equalled 5Volts. The tranny mechanic showed me there was an electric air solenoid which shifts the fork to top 10 gears and was baffled at why plugging and unplugging shifter wire harness causes the leak. it goes back there next week to do the testing and trouble shoot the air leak. I hope this is an easy fix cuz this hunk of junk is sinking me.