Found broken 3/4” male adapter going inside package unit in RTU 16 I no idea how it broke the way it did but performed a simple repair to assure client is taken care of respectfully at no charge. The return duct is slightly damaged and appears to have been for quite some time. There is a huge infestation of hornets on this system and ducting and can hardly work on it. Made client aware of the scenario and that after they are under control, we can use wall spray to help