2010 Mack CHU613 ATC issue

[The Oil Medics]

I have a 2010 CHU613 has code on dash under ABS  Sid  77  FMI 7.  I have changed both front abs sensors and the ATC / AT-3 SOLENOID ASSY.  The modulators seem to be clicking at start up as needed and I have pulled the connections and checked for corrosion.  Where else do I need to look to reset this code?

[Mackpro]

SID 77 is brake demand sensors. They are located on the foot valve on the fire wall. Go to Bendix.com and go to document library and type in SD-13-4869 and choose troubleshooting and down load it. Bendix and Eaton are great about public access to all their manuals . Also RH Sheppard steering gears too!