I enquired early April. It will be offline for "several months while supporting marine navigation infrastructure is replaced". Not sure what this means, but assume they are replacing the mechanicals etc. They included the following links.
Brisbane Airport - www.bom.gov.au/products/IDQ60901/IDQ60901.94578.shtml
Spitfire Channel - www.bom.gov.au/products/IDQ60901/IDQ60901.94581.shtml