Trip 1 - Performed service diagnostic. Diagnostic found that the secondary drain pan is rusted. Rust has made it’s way into the safety switch on the pan causing it to malfunction. Drain pan is a 33x64 inch pan. Options for repair were presented to the customer and they chose to have the safety switch and the secondary drain pan replaced. Safety switch was replaced today, and we will return to complete drain pan replacement. Our office will reach out once pan received to schedule return visit. System was function checked and is operational. Trip 2 - Secondary drain pan was replaced. System was running at the time of departure