Transfer ofChannel 50control soughtFROM THE SUN’S WASHINGTON BUREAUWASHINGTON - Merrimack Valley Communications, Inc., has applied to the Federal Communications Commission for authority to transfer control of television station WXPO (channel 50), Manchester, N.H.According to an FCC statement, principles of Merrimack Valley Communications an? requesting control of the corporation be trar,sler-red to Vcndclco, Inc.The request is not unexpected.Merrimack Valley Communications was licensed by tlic FCC to operate channel 50 from a dual, Lowcll-Manchcstcr, source. Us broadcast operations lasted only a few months and the station has been offered for sale (or nearly a year,