Clever solution for the chase and pipe.
That orange spot appears to be light surface rust. If it bothers you, sand it off and apply a coat of shiny spray paint to protect the fitting.
Most of the time, if a leak was in this location, you would see and feel traces of oil on the surfaces.
- Electricity makes refrigeration happen.
- Refrigeration makes the HVAC psychrometric process happen.
- HVAC pyschrometrics is what makes indoor human comfort happen...IF the ducts AND the building envelope cooperate.
A building is NOT beautiful unless it is also comfortable.