My top Bflat on my Roland 4500 piano has suddenly ceased to work?

http://www.roland.co.uk/articles/default.aspx?c=4

"Product Support

If, after consulting the product's owners’ manual, you still need operational assistance you can contact our product support team by logging your enquiry through your My Roland account. Your enquiry will be logged and placed in a queue where we aim to respond to your enquiry within one working day.

Product Support is available Monday to Thursday 9am to 5pm and Friday 9am to 4.30pm.

Further information and help can be obtained from the Roland forum or via the support tab on the product page where we post Frequently Asked Questions.

Every Roland and Boss product is supported by an incredible team at Roland UK. From industry-leading technical support and service, to multi-talented in-store specialists and friendly customer service staff always willing to lend a hand and help customers, Roland offers services our competition can't match.

For customers living outside the UK, we have a large network of International contacts to help you find support in your country or region, as well as a list of International websites for you to visit."

It does not matter how many people play your piano.

Peccavi
March 2013