A Pipe Organ is first of all a musical instrument, and not only an artwork and a cultural asset. To offer its precious service, it must be kept in good operating conditions, with periodical check-ups, cleanings and regulations, as well as voicing and tuning, exactly like any other musical instrument.
Where ever an organ is, in a chrch, in a concert hall, in a music academy or at home, the "machine" side of the instrument must be maintained in good shape constantly. That's the only way to keep it working and playing at its best. It's also the only way to avoid big restorations and maintenances, off course heavier both in terms of qualty and quantity of the work (and of costs, off course).
It is up to the organist, or the owner/responsible, to take care of the instruemnt, keeping in touch with the organ builder for its health and functionality.
At least every year an organ should be checked up (mechanics' regulation, windchests, ducts and bellows etc) and tuned.