Julie,
The first thing I would do is to use a hex tool (hcihd will do) to make sure there is not something amiss at the end of the PID in the offending message (like a misplaced carriage return or line feed or whatever.
I don’t think the variant tester will give you as much information as to what is wrong as the Xlate tester (but maybe you meant the Xlate tester).
Jim Kosloskey
email: jim.kosloskey@jim-kosloskey.com 30+ years Cloverleaf, 61 years IT – old fart.