My sub has not worked since picking up My11 on 3-25-12. I am only 200 miles away from the first 1000 mile service. In the owners manual on page 153 it says R17 20A is the fuse for the AMP that powers the rear sub. This would be the fuse box behind the seat on the opposite side of the sub. I pulled the fuse and mine is blown. My concern: Every time I change it to a new 20A fuse it blows once inserted in the socket. Has any-one had a similar problem? Any thoughts? An electrical problem in an English car go figure. I hope the dealer can resolve.