Marine Air Conditioning Winter Care by Australian Climate
Lay-up in Hobart and lay-up in Cairns are different jobs. In the tropics you may not shut down at all.
Marine Air Conditioning Winter Care by Australian Climate: Schedule and Equipment
Most lay-up advice is written for places that freeze. Australia mostly does not, and a system left idle in a humid climate has its own failure mode — the reversing valve and the pump seize from disuse rather than from cold.
Marine Air Conditioning Winter Care by Australian Climate: Procedure
If you skip it: In the south, freeze damage. In the north, a seized pump and a reversing valve that will not change over in spring.
Record the date, what you found and any parts used in the boat's maintenance log. A repeat change—less water flow, faster fouling, a new smell or a breaker that trips again—is often more useful to a technician than a one-off reading. Check the current manual and official sources before changing the procedure, and stop at the licensed-work boundary described in the disclaimer.