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P1000 OBD-II Monitor Testing Incomplete
P0370 Timing Reference High Resolution Signal A
I think there may have been a typo, did you mean P0703? That would make more sense..
P0703 Brake Switch B Circuit
Nonetheless, the code for the Brake Switch is what is killing your cruise. Our tuning has not been known to cause either of those codes and it sounds like there is a truck issue that needs to be resolved. It may have been an intermittent code initially and the cruise may have worked some of the time prior to this update because of this. Now that the Brake Switch code seems to be set and wont go away, that's why the cruise wont work at all.
As a test, try returning to stock and driving for awhile. Does the Brake Switch Code come on when in stock form? If so, we suggest getting the truck to a dealer with scan tool who can diagnose and resolve the code.
This has us a bit confused, all of our tunes use the same base file and we have only had a few other customers report that DTC in over 11,000 calls logged this year.