I arrived at the customer's home to perform a routine maintenance check on their AC unit. I ran the AC to ensure it was blowing cold air and checked the evaporator coil for any signs of freeze-up. I found a dirty coil and cleaned it off with a spray cleaner. I then checked the condenser coil and found it to be dirty as well. I ordered the necessary parts to replace the TXV and scheduled a return visit to complete the repair.