This episode's headline: Aspirin Warning. The guests include Dr. HEINZ EICHENWALD, University of Texas; Dr. EDWARD BRANDT, Department of Health and Human Services; Dr. JOSEPH WHITE, Aspirin Foundation; In Tucson (Facilities: KUAT-TV): Dr. VINCENT FULGINITI, American Academy of Pediatrics. Byline: In New York: ROBERT MacNEIL, Executive Editor; In Washington: JIM LEHRER, Associate Editor; LEWIS SILVERMAN, Producer; MAURA LERNER, Reporter