Hi Y/P,
Have noticed that lots of replacement RCUs don't do the whole biz. Would suggest Wiltsgrove as they check fairly thoroughly - Seems many Fleabay suppliers don't check at all.
Caught out once or twice - Note Wiltsgrove supply RCUs on Ebay, but best to go to the horses mouth for a good backup, where you can talk to a knowing tech if problems exist - Chris.