Volvo air regulator keeps purging

Hello, so I’ve got an 09 Volvo 670 vnl and the pressure regulator ( I think) keeps purging every 10 seconds. I’ve got no air leaks anywhere on the truck, my air pressure doesn’t drop when truck is off, and I’ve just replaced the air dryer filter.

Not sure what it could be now.

Also the purge isn’t short, it’s a short hard purge followed by a 2-3 second lighter purge.

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