HP Laserjet 2605dn color misalignment

[SOCPWB]

I am trying to fix a HP CLJ2605 that is printing all 3 colors about 2 or 3 mm below where they are supposed to be. I have swapped the cartridges, used the Clean ETB function under Service menu, re-caliberated it several times, and updated the firmware, none of which seemed to make any improvement. Does anyone have any suggestion on what else I could try? Thanks in advance.

[Gleq]

Hi
Check the gears if all is right
change the ETB
good luck