The dealer can take the machine apart and remove all the lint that you blow back into the machine motor. A friend of mine had a motor burn out because she used the canned air, and it just kept packing the lint back further in her machine until it got so hot that it burn out! There are some parts that need oiling that we can not reach and they can see things that might be going to give you problems. I am a firm believer in yearly check ups for my dear machines. I want them to stay in good health, purring along and stitching well. Jan