Originally Posted by builthatch
PS - you can totally remove the AP flash with no trace other than i assume some sort of total flash count change, but Cobb is pretty insistent that once unmarried there is no trace of anything remaining. i am a warranty guy too but i never fear with an AP because of that fact. even if the engine were to blow up, as long as you can still get the key in the accessory and on position, you can unmarry the AP.
I'd search this forum on this info. I've never had first hand experience but I believe that warranty claims can be and have been denied due to an AP. Like you mentioned, our checksum number will differ even if it has been un married, and that may be enough to deny your claim for any engine work.