The WM5140 is getting to be between 5-7 years old, about the age that the carbon brushes in the motor wear out. You can pick up a new set on Ebay for £6.99 including delivery (take a look at item number 131407433619 on eBay). They are pretty easy to change with the motor in situ, though, personally, I like to drop the motor out and do it on the bench.
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The WM5140 is getting to be between 5-7 years old, about the age that the carbon brushes in the motor wear out. You can pick up a new set on Ebay for £6.99 including delivery (take a look at item number 131407433619 on eBay). They are pretty easy to change with the motor in situ, though, personally, I like to drop the motor out and do it on the bench.