Upon arrival, I found the outdoor unit in lockout. I reset the outdoor unit and determined the system was low on 410a. I performed a complimentary leak search and found the leak in the evaporator coil. I had the office run the warranty and the website show that it is expired. The customer presented paperwork showing that it is registered with a 10year warranty. We will reach out to Trane tomorrow to investigate. I took pictures of the paper work and the warranty number. We will present a price for repair once warranty is verified and price is built.