2012 isx codes

[resp59]

I have a 2012 386 that has more codes and lasts less time every time it gets back from the dealer.
This time, it was trying to regain every 50 - 100 miles on the way back from Washington state.
here is a list of the codes. Some I haven't been able to find from google. All from reading the bully dog tuner. No, I don't have insite. If I quit donating to the dealer, maybe I can buy it sometime. currently I can't...
All codes from one trip Washington to Iowa...
Active Codes

code 4157: Aftertreatment Diesel exhaust fluid return valve - mechanical system not responding or out of adjustment.

Code 3574: Active after treatment diesel exhaust fluid pressure sensor - data valid but below normal operating range - moderately severe level

Inactive codes:
3375: after treatment DPF regeneration too frequent
1681: DEF dosing unit - bad intelligence unit or component.
1682: DEF dosing unit input lines - condition exists
3575: DEF pressure sensor - data valid but above normal operating range - moderately severe
3712: SCR operator inducement - data valid but above normal operating range - most severe
3714: engine derate
3571: DEF pressure sensor voltage above normal or shorted to high source

Dealer replaced dosing unit, Imap sensor within last 4 weeks, egr tubes and intake have little sooting.
I am ready to mandate the truck with a case of starting fluid as far from a fire station as I can find...oops... I'm running out of money or I would pay someone to 'fix' this system for me. quotes are 3500 for that.
Any ideas of where to start with the active codes? they don't always come on. sometimes cycling the key makes them come on... sometimes not...