Perhaps an ultrasound inspection, but then to have real meaning the equipment and operator would need to be certified for safety inspection. There is likely something similar for boiler inspections.
Probably expensive.
Perhaps the best advice was given in the video, drain the tank often and set the compressor up outside of the shop.
Personally I drain the tank and leave the drain valve open after every use. And I have my air compressor in a separate utility building on the back side of the garage. My main intent when setting it up that way was to keep the noise from the compressor outside of the garage.
