The first step in the appraisal process is to identify the appraisal problem. In this case, a major part of that would be proper identification of the intended use. Is the intended use to provide a market value for a GSE loan? Is the intended use to provide a value for a property in a REO portfolio? Is the intended use something else entirely? You need to communicate with the client to have that question answered.
As for the "as is" value, knowing the cost to cure is a good step - but the more important step is figuring how how the typical buyer of the home would react to that cost. Would the typical buyer reduce the price offered by only the cost to renovate the bath, or would the discount (adjustment) be something different? It is not as simple as just deducting the cost from the "as repaired" value.