Unfortunately, no details AT ALL of what was found where. Pity. If the incident occurred around the suggested dates, then there was presumably ash around in sufficient quantity to create problems, especially on the northern part of the routenear Cologne. Other question, of course, is where the aircraft had been on immediately preceding flights....although I doubt that anything would have been missed at Cologne with the 'heightened awareness' (aka panic) at the time.
Anyone know more / can track details of this particular flight and aircraft?