This was completed about 3 weeks ago,now have time to post answer. Actronics though it was an issue with ABS module.A garage that do TCU repairs in house thought it was still TCU issue.Through a contact we have who knows someone at AUDI TECH. Assistance for dealers meantioned wiring from TCU
multiplug up to fire wall.We combed all the wiring
from TCU as far as we could access and wiring from
PCM. all good. PUT tcu back in box and drove car and
monitored codes at each event as described. This time the last event it lost drive totally for 15
minuteS.Bit the bullet and fitted a new TCU from TPS
£771.00. Contracter initialised TCU and other software updates from Audi pass through. Job done.
Shame ECU Testing could not capture the fault in the
TCU