Morning Ann. What was the nature of the residents' concerns? I presume that the fire service recommendation was intended to protect their properties.
The normal interpretation of the 6-month rule is that decisions are not revisited unless material considerations have become apparent that were not available at the time.
There is no need for you to stand down during a conduct complaint, but you are free to do so if you feel that it would be appropriate. In this case, it appears that you have not been notified formally of a complaint, so it is merely hearsay.