I have a Trane XV90 variable speed furnace with a TXC036C A-Coil. There a two main outlet trucks, one coming off each side of the plenum. I'm measuring the outlet temp where each truck mates with the main plenum. I'm measuring about a 15 degree difference in temp rise between the two. The side the is closest to the A-coils connection ports is running about 95 degrees while the other side is at 110 degrees. What could be causing the difference ? Could it have something to do with the A-coil ?