Update 8/14/18 GM sent a engineer out for the last repair done to my vehicle. The technician and engineer test drove the vehicle and were not able to duplicate my cruise control problems. They installed 39081933: SL-N-Retainer (04634-BC) performed #16-NA-147 and installed foam spacer behind the new retainer to take up possible brake pedal slack. Relearned brake pedal position in ECM and BCM. I have not had any problems since they did this repair.