Hi Matt,
Im definitely way more of a firewall guy that endpoint, but let me try my best to help you out. Yes, I know, R77.30, so totally understandable why you are apprehensive to contact TAC. By the way, please message me privately and we can certainly do remote session Thursday morning if you are free (Im EST time zone). So, looking at that error, Im 90% sure it has something to do with the corrupt files in $FWDIR/conf directory...Im assuming this is the same server managing your gateways as well? Not sure if you might have another R77.30 server that you can navigate to that directory and copy the whole content into the problematic one (after you back up all the files first, of course : ), because from what I recall, I had never seen an option in the endpoint server to do database revision control like you can in regular dashboard, but I will double check. Sadly, I dont have any R77.30 machines in my lab, as you cant even get the file on CP site any longer, since it has been unsupported for 1.5 years now.
Best,
Andy
"Have a great day and if its not, change it"