Maintenance dacula. Evaporator coil on basement unit was frozen over. Thawed out the coil and did a leak search. Found a leak and that is why the coil is freezing due to low pressures. Recommend replacing coil under warranty. Blower wheel is clean. Changed filter. Cleaned out drain pan of water. Drain line is clear. Outside capacitor is within range. Did a leak search on main evaporator coil and upstairs evaporator coil. Did not find any leaks. Indoor capacitors are within range. Blower wheels are clean. Changed filters. Cleared drain lines. Outside capacitors are within range. Pressures are within range. Left basement unit off at thermostat so it doesn’t freeze again. Other two units are cooling at this time.