What is the best way to determine the patch level of a installed K2 instance?

 I am trying to debug a problem, and I am not entirely certain I upgraded the MOSS front end to  0803 Patch (4.8075.1.1) KB000289. I have checked the GAC and I notice that the SourceCode.Install.Common assembly has an assembly version of 4.8075.1.0 which seems to indicate that the patch is not installed. But when I attempt to run (re-run?) the patch installer it does nothing. The K2Setup.exe process starts for a few seconds and then exits without any user notification. So I assume that means that the patch was already installed and the setup is refusing to run.