I have found the parts behind the tin cover at the back, there are two items. One is blue with a part code of BY80016-00 (blue square ish) and another is 003X36 (black, oblong).
There appears to be no burning etc around the item and one report I found on this site (http://howtomendit.com/answers.php?id=272365) says that the spark generator could be disconnected to see if this is the faulty item.... but not how to 'remove' it :-) Hope this is of some use to someone!
Steve
January 2015