In the Expose a Weakness outburst description (p. 17, column 1, paragraph 6), the penultimate sentence says, "Until the end of the scheme, reduce
the TN of Scheme checks made by the character who exposed their weakness." It doesn't say by how much the TN should be reduced; I assume it's by 1, as an inverse to the effect listed for the Shut Down outburst in the second column on the same page.