An Oregon state appeals court Thursday let stand $135,000 in damages levied against the owners of a Portland-area bakery for discrimination after they refused on religious grounds to prepare a wedding cake for a local lesbian couple. A three-judge panel of the Oregon Court of Appeals rejected a petition by Melissa and Aaron Klein, former owners of Sweet Cakes by Melissa, to overturn the ruling by the state’s labor commissioner as a violation of their rights under the U.S. Constitution to freedom of religion and expression. An attorney for the Kleins, who closed their bakery not long after being ordered to pay the heavy fine, could not immediately be reached for comment Thursday. “Today’s ruling sends a strong signal that Oregon remains open to all,” Brad Avakian, the state’s labor commissioner, said in a written statement. “Within Oregon’s public accommodations law is the basic principle of human decency that every …