I opened up the shifter area as detailed in Audipages here, http://www.audipages.com/Tech_Articl...erremoval.html

and had a good look around (like a blind man at night in the fog). Vacuumed out two ketchup packets, put everything back together again but to no avail - the car still drives beautifully, shifts cleanly without any issues but it just doesn't shift in tiptronic mode. Now I will have to see if there are any switches that I can replace. Any ideas anyone?

Jon