Technician arrived on site and visually inspected that the drain line had backed up on the unit setting off the wet switch underneath the unit Technician explained to the customer that this was only a visual inspection, and that further diagnostics would be needed to see if that was the only issue with the system. The customer denied an in-depth inspection due to time constraints but wanted the technicians on site to clean the drain line while they were there. The technicians then cleaned and flushed the drain line as per the customer request. Customer also signed up on a HomeCare plan to have their system inspected on a future date. The technician explained to the customer that due to not completing a full inspection at this time that they waive TE of any responsibility of any other issues that can occur with this system.