S4 36 degree Focus problem

Hi all,

We have a number of S4 36 degree lenses, recently one of our customers noted that when shuttering down the lower projected shutter had a "bleed through" or "shadow".

we have looked at most of our kit and this is true for a lot of our units, also I can not focus out to get the "doughnut" or dark area,

we have cleaned the most of the lenes's, one at a time so as not to mix things up, all back in the right slots, only got this problem with 36 degree 

has any one else had this problem ?

and if you did how did you fix it ? 

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