Removed all existing flex duct, buckets and supply grills. Built and installed new return plenums and extended supply plenums Pulled the blower motor and cleaned the wheel and blower housing. Cleaned the evaporator coil with Blackhawk spray and water. Cleaned the primary drain pan. Cleared the interior and exterior of the air handler. Installed all new flex duct, buckets supply grills. Upsized where needed. Sealed all connections with mastic/hardcast. Cleaned the return air grills in the hallway.