Q: I upgraded to Mountain Lion, ran permissions afew days later.  Yesterday I tried to run permissions and the only line that came up was ""SUID file"system/Library/core services/remote management/ARDAgent/contrents/Mac OS/ARDAgent" has been modified and wil

As long as the report ends up with 'Permissions repair complete' then, as far as permissions go, you are fine. You can ignore the various statements in the report:

Permissions you can ignore on 10.5 onwards:

http://support.apple.com/kb/TS1448

Using 'should be -rw-r--r-- , they are lrw-r--r--' as an example, you will see the that the permissions are not changed, but the | indicates a different location. This is because an update to Leopard onwards changed the location of a number of system components.

The article linked does not seem to contain the specific error/warning that ronaldfromkerrville mentioned.

I also received that same warning when using Disk Utility with Snow Leopard BEFORE upgrading to Mountain Lion.

It was the exact same warning - "SUID file"System/Library/Core Services/Remote Management/ARDAgent/Contents/Mac OS/ARDAgent" has been modified and will not be repaired".

Again, I received that warning with Snow Leopard when I ran Disk Utility "Verify Disk Permissions" which found problems and so I ran "Repair Disk Permissions".  And everything report back "Permissions Repair Complete", except for the "Warning" above.

I just ignored it and upgraded to Mountain Lion.  I am having some problems now which I tried to address on another thread.

Is this something I should be concerned about and that needs to be "fixed"?

No!