CQ issue in mp3555

[mdfurqan2012]

I recently install two machines model mp3555 in a printshop having light copy/print issue.
Currently machine 1 print counter is 44 thousand and 2nd machine counter is 63 thousand both have same light copy/print issue.
I replace genuine developer and opc drum but after 10 to 15 thousand prints copy/print light issue occurs again.
kindly guide me.

[Popolopo]

Have you reset the part at SP3-701?