Distributors can refuse a full paid repair job if they wish. Sumiko used this tactic to try to cut down on gray market product sales back when Tweeter was selling SF. There was one "dealer" in particular who was selling gray market speakers very openly on this site. There was other gray market product being sold from Europe. From what I can tell, the gray market for SF in the US has disappeared or been greatly reduced.
People may not agree with the practice, but there is no requirement for a distributor to sell parts or do repairs on gray market product.
People may not agree with the practice, but there is no requirement for a distributor to sell parts or do repairs on gray market product.