0843 ET - Treasury yields slip to start a week that features GDP update, PCE inflation and Fed Chairman Warsh's first Jackson Hole speech. The decline on long-end yields intensifies after CNBC reports, citing anonymous sources, that the Treasury could use its $1 trillion General Account to fund the planned increase in buyback operations. Economists surveyed by WSJ expect the second revision of 2Q GDP to remain at 1.5% annualized rate. PCE inflation is forecast to stay well above the Fed's 2% target. The 30-year yield is at 5.239%, down from Friday's settle of 5.276%. The 10-year drops to 4.708% from 4.737%, while the two-year ticks higher to 4.238% from 4.232%.