2010 Audi A3 with DSG came in. Wet clutch came apart and fluid leaked out, large leak. Replaced flywheel and clutch pack.  Performed teach in procedure with laptop and drive schedule as per procedure all went fine.  Noted a lag on take off and a lag in reverse.  Has a fault code P1815 Pressure control valve and goes into failsafe, clear fault and will be ok until key is cycled.  Could mechtronic unit be damaged? New fluid and filter installed.