If anybody on here is interested let me know, willing to pay for the work.
I am looking to have a custom user defined parameter/definition created for GM ly7 and LLT engines that modifies the error band value of the timing chain (CKP CMP correlation). GM issued an updated calibration for this very parameter, so I would imagine you could just compare the updated and original calibrations to find the location of the change then create the definitions file from that.
Thanks!