Looking like the cleaning unit is leaking at the seal at the back of the unit.
so what have you done ?
If the dots are repeated can be damaged drum due to the proximity or spark of the corona.
Practice makes perfect
If it ain't broke, don't fix it
A picture is worth a thousand words
If you want something done right, you have to do it yourself
Thank you for all advised.
Did you rewire the corona units?
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