Updated by William Dunklin, listing this website as a source of information: http://www.center4art.org/about/.
Congregation closed sometime after 1993 and merged with a Baptist congregation in nearby Cortland, NY. The Homer, NY building is now the Center for the Arts, but the organ appears to have been removed. Its fate is unknown.
Identified by James R. Stettner through information from the Estey Opus List, published in The Boston Organ Club newsletter, 1973-1979.