I would open it up and change the shaft seal and inspect the o-rings. If the o-rings are squared or flat, and not round, they need to be replaced. Make sure to lube them with some magic lube or a similar Teflon lubricant and not Vaseline. When you lube them, just put on enough to make them shiny, no need to over do it and waste lube.
Don't be afraid to do it, it's very simple!
Don't be afraid to do it, it's very simple!