9. Manufacturers shall, further to a reasoned request from a competent national authority, provide it with all the information and documentation necessary to demonstrate the conformity of the product, in a language which can be easily understood by that authority. They shall cooperate with that authority, at its request, on any action taken to eliminate the non-compliance with the applicable accessibility requirements of products which they have placed on the market, in particular bringing the products into compliance with the applicable accessibility requirements.