I restarted my MBPro and re-ran DU. The "offending file" messages (i.e. stackshot and ARD notify) no longer appear in the latest log.

The only entry remaining is the SUID one for ARD - which I will, as suggested, ignore.

Still . . . if you want to take the time, the SCAN TERMINAL COMMANDS info would be useful if needed in the future.

Thanks.