I think you'll find it goes like this;
Airport installs navaid (generally paid for by airport)
Navaid is calibrated by Aeropearl (under contract to Airservices, but paid for by the airport....at least initially. Recalibration paid by Airservices....I think)
Navaid operated/maintained by Airservices (cause they are only organisation that can operate navaids (excluding RAAF).