What do i need to change on my DCF model if it asked to ''Ensure that the DCF properly handles purchase accounting adjustments (e.g., double-check the Cash Taxes on EBIT calculation) ?''    

One key piece is the Recovery Analysis.  Estimate Enterprise Value EBITDA Multiple or similar metric if ''going concern'' assumption (i.e. the business will continue operating); OR Estimated Liquidation Value Add Excess Cash and subtract estimated restructuring costs (e.g. a few % of EV) Now lay out the Debt pieces in order of ...