I am unable to re-tune a customer's truck since his dealer reflash for an EGR replacement. The tech tells me that this is a fairly new reflash and in cycles the EGR motor when the ignition is opened. The message I get is something about operating system and right after that something about range error check. This truck ran great and I never had any problems tuning it or any of the other dozens of LBZs for that matter. My guess is the new calibration# is not supported by the software? I would really appreciate help in this matter asap. Was wondering if downloading 7.5.5 or even the 8.1 would help but I noticed both of those are months old. Please help, thanks.