Upon arrival, I inspected the air handler and confirmed that the heat strips needed replacement, which were under warranty. I contacted Johnstone to verify we had the correct heat strips for the application. Preston informed me that the air handler had been modified previously. I proceeded to replace the heat strips, ensuring the system was correctly configured to perform efficiently. After completing the replacement, I tested the system to confirm it was functioning properly. The customer is now up and running, and I collected payment upon completion.