Hp indigo 5000 ending mark

On the beginning you see magenta and further magenta + cyan

 

yes when i print 4 color separation its white as seen in grey same job when printed 4 color show magenta witch mean missing black and cyan i know its a weak spot i checked the pip drum and the ITM drum no defect i checked even the impression drum for some defect but i cant see any things ... i know its hard and i know its the second transfer because its in the same spot between the itm drum and impression drum ...ONE THING I TRAY IT TODAY I PRINT A JOB CMYK AS DOUBLE HIT ALL 4 COLOR AND THE PROBLEM IS GONE ? i know it still there but just to show other idea if that can help