Delta T is 18 degrees. Air filter is dirty. Air circulation system is clean. Both indoor voltage enhancement systems are below factory spec and should be replaced. One is rated 4uf and reads 3.3uf. the other is 7.5uf and reads 6uf. Sprayed cleaner on indoor Heat transfer system. Leak searched indoor heat transfer system and found no leaks. Purged and flushed clogged water removal system. Scoped combustion chamber and found no areas of concern. Outdoor amp readings are within factory spec. Outdoor voltage enhancement system is within factory spec. Sprayed down outdoor heat transfer system. Checked refrigerant levels and pressures and were within factory spec.