I have replaced the motor on the Dc07 Animal,the Hepa filter and the washable blue filter.The problem that i have now is that when the hoover is being used,there is a lot of noise from the washable filter casing,i have had a look and there is a spring inside that looks like it is some sort of suction valve that operates in an emergency in case of blockages.The hoover works fine apart from this noise....any Answers?