We won’t rope you into a “factory authorized service technician” agreement. Most minor adjustments and repairs can be tackled by the end user.
If the refrigeration circuit requires service, you’ll need a licensed contractor. AirPac air conditioners can be serviced by any licensed HVAC contractor. A good place to start is with your building engineer or owner. If they don’t have service personnel assigned to your building, they may recommend a contractor who regularly works in the building.
You can find potential contractors through the Air Conditioning Contractors of America (ACCA) website.