This episode's headline: El Salvador: Coverup?; Bank Stocks Dip; Phone Wars; Afghanistan: New Soviet Push. The guests include In Washington: Rep. MARY ROSE OAKAR, Democrat, Ohio; JAMES MICHEL, State Department; ABDUL RAHIM, Afghan Resistance Leader; In New York: JOHN LYONS, Bank Analyst; SELIG HARRISON, Afghanistan Expert. Byline: In New York: ROBERT MacNEIL, Executive Editor; In Washington: JIM LEHRER, Associate Editor; JUDY WOODRUFF, Correspondent; Reports from NewsHour Correspondents: ELIZABETH BRACKETT, in Charleston, West Virginia