RTB and clean it. Then tell the CP what you did. If he is being a crunt tell him the clients were asking what the light was that was coming on and you don't lie to clients.
A decent CP wouldn't have any problem with that.
If you are out Bush which I guess you are, return to the camp and clean it. It's always a good idea on bush work to carry a spare filter to use while you wait for the dirty one to dry. Then that becomes your spare.