0 air pressure to truck, help would be greatly appreciated and DPF issue

Any suggestion would be greatly appreciated.

The issue i am having is there is 0 air pressure to truck and will not build air at all. Brakes will not release.

Truck will move if slack adjusters are opened wide.

I am not sure if the issue is related to DPF (diesel particulate filter) but truck will not do a parked regen since there is no air pressure and shuts down after a few minutes.

Scangauge shows a boost reading of 17 at 1500 rpm and displays an error code 'Id 3719 fm 00 cnt 34'.
(upon researching i come to find this code indicates soot level high)

Truck on board diagnostic shows code. eng high 128s 155 00.
(google shows that this relates to DPF)

Thanks in advance and any suggestions would be greatly appreciated. Need to know if DPF issue will cause Air build up loss or vice versa.

 

i will check it tomorrow, i have truck parked at yard. Thanks

slight air leak under batteries, then again it nay have been exhaust noice. I will get under the truck with a bottle of soap and investigate

 

its a 2009 freightliner Century, i will go back to truck in the morning to have a look and report back, it was dark when i was troubleshooting, Thanks

 

steps to do a parked regen involves applying and releasing parking brakes, if there is 0 air build up would you think that this will affect parked regen, Thanks

 

My mechanic said they charge $300 to remove DPF and says he has a guy come in to clean them for another $300, does this sound reasonable