Replaced damaged return box under air handler in garage. Suspended air handler with strapping and slide new return box under air handler. Did not remove any refrigerant at all or disconnect any wiring. Sealed all areas on return box. Ran new condensate drain outside. Tested and cycled system and system is operating properly at this time. Did not install ez traps due to garage being unconditioned space and the traps and freeze and crack, unit downstairs in high efficiency gas furnace and we don’t install ez traps on gas furnaces. Unit gravity drains into sump pump 3 feet away.