WASHINGTON, D.C. - The U.S. Supreme Court on April 22 declined to review a Sixth Circuit U.S. Court of Appeals ruling that retired employees are not precluded from litigating for themselves the question of whether their health benefits had vested based on a judgment in favor of the employer in an action brought by unions (PPG Industries, Inc., et al. v. Patricia L. Amos, et al., No. 12-1089, U.S. Sup.).