Resolution Of Grading Conflicts

No and it's unlikely there ever will be. As westernsky noted, read the fine print on any submission form to find the disclaimer. Now if one TPG said genuine while another said questionable authenticity you might have a case if the coin was indeed counterfeit.

I doubt if there ever will be some sort of resolution to differing opinions of TPG's.

Although PCGS Photograde has done much to provide a visual standard which is open to publio inspection,
at the end of the day it is only the subjective opinion of the human grader who has graded an individual coin.

I nevertheless humbly thank PCGS for proving their visual grading standards.

It would be very difficult to provide a legal framework for resolution, if there is a differing and subjective opinion between the various TPG's. This allows room for the basement slabbers, unfortunately.

It is much better if the collector himself can make an informned opinion of his own coins, and at least reserve grading fees and shipping costs for the more valuable items in his collection, which he may consider selling. That gives a warm fuzzy feeling to an individual who is considering a more expensive coin.

The TPG company's policy should always be
"All care taken, but no responsibility can be accepted", and be a legal industry standard. Nobody whined about it.
Kodak used to have a similar policy for processing pictures.
That must be in the business statement and stated on every invoice of every TPGrading company.