Sears, Roebuck agreed to sell disk drives made by Chatsworth-based Tandon Corp. through its chain of 105 office equipment stores . . . Electronic Data Systems, a subsidiary of General Motors, reported that it has been awarded a $200-million office automation contract by the U.S. Department of Agriculture . . . Pacific Southwest Airlines, which eliminated its flights to Mexico in 1982, plans to offer three weekly non-stop flights between Los Angeles International Airport and Cabo San Lucas, Baja California, beginning in November . . . Kennington Ltd. said it purchased all of Aircraft Bearing Corp.'s outstanding stock for $3 million.