Blown Transmission/Glycol

[Maximus Gladious]

I do think the incompatibility is going to be the issue, that lingering OEM fluid and Amsoil incompatibility will be the killer to warranty ; the fact that they are incompatible, known prior to the change, and done anyway, will limit your success on this.. Short of totally dismantling trans, lines, every recess cleaned, the KNOWN incompatibility won't let you out of the gate.
The Glycol would have been a convenient "cause", but once an Escape Route was introduced, Warranty Denied.
Even Amsoil will bow out on this ; their fluid may be better, but they can't / won't argue for you if any chance of contamination with OEM.
A Lab Test to show Amsoil is " pure ", no OEM, would bolster your case ( or prove it fruitless if OEM is prevent)

Asked AMSOIL about the compatibility of the two oils and about mixing or not mixing. This is AMSOIL’s reply:

The fluids will mix together. Mixing is recommended at a minimum, but the fluids are compatible with each other (just because then you won't get the full effects of AMSOIL). There is not an option for a pan drop for this transmission (that is when both fluids would mix) and the only information we have on our website is for when you do a complete fluid exchange (when the fluids wouldn't mix). Maybe that is where some confusion was because we don't have an option for a pan drop for your vehicle. We only list an option for changing out all of the fluid.

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