I own a Wren, and never had a real issue with the service centers. so I would have to side with Ron on this. It's 4 years old, and you don't want to send it in? Honestly... I don't think any company will sell parts for a current engine. (will they?)
And finally... you've been a member here for 8 years... and only have 27 posts you your name. To me... you haven't built enough of a rep for me to believe you, over Ron. (sorry)