COMCO MICROBLASTER Dual chamber needs serviced or use for parts

This dual chamber Comco microblaster needs to be serviced by the company or you can just use it for parts. It turns on, holds pressure and also releases pressure. What doesn't work is the abrasion. Nothing happens except for clicking noises when you press on the pedal. I would think Comco can service this and get it up and running properly. I have upgraded to the Accuflo so this just sits in the garage....