Performed 1 system diagnostic for main level unit. Unit is a 3 ton Trane that services the Maine level. Indoor unit is located in a low crawl. Found unit with dirty blower wheel, no drain pan, no water safeties, low charge, pitted contactor. Due to unit being 18 years old and cost of repairs customer would like estimate for replacement ASAP. Based on our findings today, it might be time to think about getting a brand new system.