If your Miele technician was a technician actually employed by Miele and not an independent repair company who happen to repair Miele machines then he would be more qualified than anyone on here to know what the problem is. I would think if the lights are flashing in a rhythmical pattern and not randomly then the control unit is in control and is indicating a problem with another component. Unfortunately I don't know what this sequence is indicating. Best to consider which parts were removed during the repair and were they all put back correctly, if drum removed possibly static brush sensor on top of drum became disconnected or connections to the paddles (there may be a carbon brush in the idle end of the shaft that has fallen out) Cheers
kenjo
July 2013