Upon my arrival in Smithville, for air conditioning tune-up. Customer had 3 concerns. 1- downstairs registers have a 10+ degree differential when system is on. That is strictly due to the system. The system contains 3 zones all which are operated separately or simultaneously. 2- furnace doesn't work. I tested both upstairs and downstairs multizone systems and found them to be working in both heating, cooling, and auxiliary heating. 3- the condensation drain on upstairs unit is broken. This drain had to have been broke by force, either stepping on, or hitting/striking the drain. The drain pan must be replaced in order to re thread a new drain portion onto it as the amount of force to have broken it most definitely may have cracked the inner lining. As of this time left downstairs unit in auto mode.