I have an approximately 15 year old Bosch dishwasher, model SHE58C05UC. It has worked flawlessly for years but today during the rinse cycle I heard a high pitched buzzing noise and it was not circulating the water. I removed the filters at the bottom and still had the high pitched buzz and no water circulation. It made it fine through the actual wash cycle, only started hearing the noise and having the issue in the rinse cycle. I turned the power off and then on again and same issue. I finally did the cancel/drain just to drain the water and it drained fine. Would it be something with the recirculation motor/pump (I think that's what it's called)? Any ideas? At 15 years, it would probably be better to buy a replacement instead of repair?