Removed old duct board and heat pump system. Replaced with a new 4-ton heat pump system. Installed extended plenum. Removed the old drain and installed a new drain. Removed the old drain pan and replaced it with a new drain pan. Replaced condenser pad with new pad. Brazed in new condenser. Brazed in new heat pump filter dryer inside near coil. Reattached ducts. Pressure tested and vacuum tested. Drain cleared. Everything is working properly.