A/C system had lost efficiency due to suspected gas loss.

Customer advised by Holden dealership that the part required to rectify this issue was on back-order, and not currently available (hose set assembly).

Confirmed that the A/C system had lost its charge of refrigerant gas.

It appears that this is a common failure on this model, having see two vehicles with the issue within a 3-week period and significant back orders at Holden for the OE part.