HARRISBURG, Pa. (AP) — The looming end of a business relationship between Pittsburgh-based health care giants hangs in the balance during a hearing before a state judge. Commonwealth Court Judge Robert Simpson plans to issue a decision this week about whether a consent decree involving Highmark Health and UPMC can be extended past its June 30 termination date. Its expiration will trigger higher costs for Highmark insurance customers who use UPMC’s network of providers.