Had a quick look in the service manuals - the process is as follows:
1) Press “Menu > # > 1 > 9 > 3 > 4 ” on the control panel continuously.
2) Press Menu.
3) Select “Tech Mode”
4) Data setup > Clear counts > Fuser
That should do it.
Also, you can check your old fuser - if you use a good smooth paper, your fuser should last at least 80k pages.