It's not your typical 'Recall'. A 'recall' is only for safety issues, and that's when Holden has to inform the government, ACCC, all relevant bodies ect. Affected customers are contacted via mail, obviously. Example: Current seat
belt pre-tensioner recall
The A/C drain seal is what you would call a 'rework'. Not a safety item. Customers do not have to be contacted via mail.
Government, relevant bodies not involved. Holden decides if reworks are worthy of a mailout of letters to affected customers based on the issue. For example with the A/C drain seal rework, it works out cheaper for Holden to send a letter to affected customers to get them in ASAP to replace the seal before the carpet gets saturated and hence needing replacement which Holden has to cover. $2.50 piece of rubber seal <-----> whole new carpet.
You get the point.
There is also a BCM update rework currently for PEPS fitted VF/WN's. Holden has decided that it's not worthy of a mailout and to only carry out the rework at the next service or if customer has a complaint which matches the rework.