Below are the listings of both the Modification Bulletins and Service Bulletins issued by Slingsby upto 29 November 2010. Although the documents show Feb2010 and June 2010, they were issued on 29 November 2010, indicating that there were no updates upto that date.
The T67 Series Manuals listing was issued by Slingsby on 10 Feb 2011, also indicating that there were no changes until that date.
Modifications Bulletins up to 29 Nov 2010 (PDF 308kb)
Service Bulletins up to 29 Nov 2010 (PDF 389kb)
T67 Series Manuals Status Feb 2011 (PDF 60kb)