2020 Volvo VNL 12 speed auto transmission with air leak

I have a 2020 Volvo VNL 12 speed auto transmission with 93,000 miles. The truck loses 30 lbs of air sitting still idling on the secondary and primary tanks. No one can find the air leak. It has been to a local shop, company shop, and two Volvo dealers. The crawled through it with soap mixture, they checked the air-bags, air dryer, all normal connections, and the actuators in the transmission all passed "tests" that were done. It was within the normal operating range, yet the truck is still leaking. They tried to say it was the rocking of the truck, yet when it sat for 2 days at the truck stop while I went home, both tanks were completely drained. I know of 2 other trucks that seem to be having the same problem, same make and model and they can't seem to get an answer either. Wondering if anyone has run into this and if they found a solution or if this might be a recall issue that they are not wanting to fix yet.

 

Thanks for the reply, according to Volvo, they checked through a series of tests of the transmission including vents, and found nothing, now "what" they checked is unknown, since the tests run are not available to me, it goes to the company I am leasing from. Since this is an automatic transmission there wouldn't be a rubber boot around the shifter, everything is pushbutton in this model.

 

Thanks for following up on this Baha, I will be checking with shop in the morning, have them crawl around and check those issues, maybe we can get lucky and it was something overlooked before. Will let you know what happens.