As far as being privileged, I was told that the name of the party who wrote a letter to the school department was "confidential" yet, it surfaced in a statement made to my union lawyer. The guy also is a crossing guard. The other criteria have been met.
Yes, I'm still beating that dead horse of being fired. Sorry.
Information communicated by an employee to an employer about a matter of interest to that employer/company would generally be considered a privileged communication. The reason for these types of communications being privileged is so that employees can tell their employers about what other employees are doing or are suspected of doing that could harm the employer. They are able to tell their employers without fear of being sued for defamation if what they say turns out to be false.
These types of statements are covered by "qualified" privileges, however, which potentially can be challenged and defeated if it can be shown that what was communicated by a person was communicated with actual malice (a knowing falsity made with the intent to cause harm).
The fact that the union lawyer learned of the statement about you, and who said it, is not surprising because everything needed to be disclosed to the attorney. Disclosures made by the employer to the attorney would also be privileged. And most hearings on the matter would be privileged.
I understand that you feel your reputation has been harmed by statements claiming you were not at your crossing guard station at your assigned time. I know that you feel you were not given the opportunity to defend yourself properly against the false claims. But I do not see that you have a defamation action that you could pursue with much chance of success against the person who made the initial report to your employer.
I believe it is unhealthy for you to continue to concentrate on what happened. If you qualify for unemployment benefits, I think that is the most you can expect from your job termination. You might want to divert your attention away from your old job and toward finding another job (although I am aware this is easier said than done when age and health are factors). Perhaps you could do some volunteer work until a satisfactory paying job is located.
You can run your situation by an attorney in your area if you want a personal review but I am afraid I am not seeing any legal action you can take based on what you have said in this thread and in your other threads. Sorry.