I just had a text this morning about this, and asked dealer to email me the recall notice. Have attached as per this post, but had to break it into smaller PDF files, numbered A thru D.
Looking at the pix in the recall, it seems that the brake pipe ends have been reinforced; guess these were being stress fractured with vibration. Seems it affects the front brake circuit only.
I am not going to rush to get this recall done on my 09 GSA as its booked in for its 18,000 mile service in July. Will keep an eye on the fluid levels.
I seem to recall some chap in Germany having issues with brake failure and killing himself. If my memory is correct, at a guess this recall is to do with that.
M.