Just bought the truck a little of a month ago. Ran great but wanted to get ahead of weaknesses in the 2nd gen so I replaced the lift pump with an AirDog 150 which worked from first start with no issues. It had an Edge programmer installed along with a PacBrake exhaust brake but neither seemed to be functioning at 100% or in the case of the exhaust brake, it just didn't function at all.
I got the exhaust brake to work, kind of, by cleaning out the vacuum solenoid. The truck seemed to