[Error Code] Konica Minolta C1085, C-2733 code

[stavrov69]

Hi, I have Konica Minolta with 1.6 milion copies on it. Over night it showed C-2733 error when I start the machine and whet it is starting adjustment, I've tried swapping transfer belt, changed PRCB board, and HVPS/3 board but the error remains. Any suggestions what I should do next?
Thanks in advance

[Synthohol]

[stavrov69]

Thank you for the tip it worked, I changed the drum. I can't believe I didn't think of that first, I started with bigger tasks.