This puts a different perspective on the request and I respectfully suggest that it would be inappropriate to involve the Squadron Association in such a matter. They have limited reach internally (generally, few currently-serving personnel are members) but more importantly they have no standing whatsoever in the type of matters you allude to.
There is a very clear path for you to take and that is to
lodge a service complaint on behalf of the individual. You may point out that this is a slow, bureaucratic process, and you would be correct. But this is a consequence of the sensitivities involved, potentially involving tacit admissions of error or liability. It would be totally improper for the current Squadron or the Association to become involved in such matters. Consider also the fact that the personnel involved may have moved to new roles.
The distinct advantage of a service complaint from your perspective is that, if a fault is uncovered, any resulting change in policy or procedure would be applied centrally with high-level oversight and would apply across the board rather than in one squadron alone.