I like tryme's post. I would open it up and check it. If it is nice and smooth, it is probably good, but you also have to look at the memory of it as it may have heated a memory into it and may not pump like it is supposed to. They are about $35 on the internet. I have a spare in the boat so I can change it out in a pinch with out wasting a day on the lake. I would order a spare and leave it in there if it seems to be doing good (and looks good), just keep an eye on it as it is the main artery to the heart.