This is the numeric health status code for the Anti-Virus blade's engine overall. Because this status is scoped to the AV blade specifically, a bad code here while the gateway's own svnStatCode stays healthy tells the admin that virus scanning specifically has stopped functioning, for example an engine crash, even though traffic is still passing through the gateway unscanned. For example, this code reading a problem value while traffic continues flowing normally would mean files are passing through without being scanned rather than the network itself being down.