Yes, before tearing every thing apart check the cooling fan on the back of the pump and make sure it is clean and free of dirt. If you have too, disconnect the pump from the tank. Un screw the front bolts that hold on the front housing. When taking things apart always do it some place where you can easily see things that may fall out. Pull the front housing off, look for anything that may be broken and making the noise. Next remove the impeller. Inspect all items and surfaces of the impeller outer case and inner case. Remove any objects that should not be there. All surface should be smooth. The O ring, and all the other surface should be carefully cleaned and wiped down. If there are calcium deposits you can soak in a vinegar solution and scrub with a old tooth brush. Reassemble the pump being careful not to pinch the O ring. Hook up the pump and add water to check for leaks, if no leaks turn on pump. If you had the pump worked on recently, I believe you mentioned something about the front seal being replaced, even though it was a new part it could still be defective or perhaps not installed properly. Hopefully this help you out some more, let me know how its going. Vince