Here's the story - the tenants reported that the ducted AC leaked like a mofo and requested a technician to visit site. Approved. Then no faults found but the tech gave it a bit of a service anyway. Since there's no fault, I don't really want to pay for it but ditto for the tenants. Their argument is the AC haven't been serviced for 12 months. Are there any rules/laws etc stating the AC has to be serviced every 12 months? Should I pay up (it's only $185) and to put it into context, I have no intention to keep the tenants there beyond next year.