Tech did not find any issues with duct work tech did find unit supply is a plenum box with 2 flex supply lines going out each side and room is last on on the line of air flow tech did check unit found indoor coil rusty tech also checked delta t and found lower then normal once tech checked refrigerant pressure tech did find unit was slightly low on refrigerant tech did educate customer on refrigerant levels and informed them on unit might need to be added refrigerant if that’s the case there is a leak homeowner is military and is likely to relocate so they decided to wait till summer to see how unit functions customer did invest in mpa