Indoor Unit Air Leaks

My house has 2 AC units. One side of the house is has cold air, but it’s coming out of the vents very slowly. I went up to the attic where the indoor unit is. There was significant velocity of cold air coming out of each is the three openings in the side of the unit and the condensate pipe. At first I thought the three holes needed to be sealed, but the condensate drain stumped me. Any ideas?

My house has 2 AC units. One side of the house is has cold air, but it’s coming out of the vents very slowly. I went up to the attic where the indoor unit is. There was significant velocity of cold air coming out of each is the three openings in the side of the unit and the condensate pipe. At first I thought the three holes needed to be sealed, but the condensate drain stumped me. Any ideas?