I think I made a simple adjustment and got rid of the 403 (and 501+2) errors on both LG and TSi ...

Let me know if you notice them again, and try and note a time of day ...
It MAY be related to a CRON JOB on the site, but I don't think that's it ...

Thanks ...

I've decided to include this for a reference ....
https://wiki.simplemachines.org/smf/Mod_security_-_Having_problems_with_mod_security