I was able to get in touch with a TurboTax agent, and thought I'd update this question for anyone else looking in the future. We determined that the confusion I was having was because I hadn't yet set up the property itself to be deprecated. I made that choice originally because this is our primary home that we're renting out (not a property we purchased to be a rental). After speaking to the expert, I decided not to add the property as a rental asset, and not to deduct the plumbing expenses as an asset to be deprecated - instead, I will take the full sum of the plumbing expense against the total sale value to reduce my capital gains tax in the future when we sell.
