not specifically but certain points would point in your direction without any doubt. No one is saying you are not knowledgeable or don't have more experience with that panel than anyone else.
the fact the installer did speak to them initially, and didn't resolve the issue and did some test of which we don't know the outcome, would to me say, either they didn't ask for the correct tests to be performed to verify the state of the panel or its something else that isn't usually picked up on.
however its more likely to be and it isn't x,y,z
Now on the visonic panels, you have an engineer and a sub engineer, the sub engineer can do everything the main engineer can except for two things, 1. is defaulting the panel I think from engineering 2. cant remember but sure I can look it up if needs be.
attended a few for maintenance/ fault repair, often the actual installer does change the engineers code but not the sub engineers code. sorted issues out without the need to default the codes, however if it was going to be maintained regular by me I would have defaulted the codes and changed them both.
One of the reasons you don't give an end user an engineers code is to stop them from fiddling with the alarm, some will fiddle others won't.
leaving the sub engineers unchanged does help them get into the menus and change things.
No one is saying that your not right and when you get call outs due to faults you learn what customers get upto but shouldn't, I ask them to be honest as it may help get to the issue quickly and be resolved and ask them a few questions before testing/ interrogating the panel.
EX, used to install, have you retired?
keeping things simple is a matter of a persons comprehension, not necessarily anything else, you see regular posts on here, some are quick to pick things up and have spent many hours reading manuals and getting confused, some simply have no idea.
I am not sure which part of the thread was particularly technical, but maybe it is if they have no idea then they would normally ask for someone to elaborate.
as for forum behaviours in general, some may consider it rude to jump as a newbie and attacking other established members, whether they are right or wrong there are often better ways of approaching things. (By the way I am not known for my tact either in many circles).