Passcode to Reset Photocopy Machine Drum Counter

My Librarian is looking to replace our drum since it has passed the 20,000 copies mark. He informed me that once the drum is replaced he is required to enter a passcode to reset the counter for the new drum. Where should I go to get the passcode to allow us to reset the counter?

Make? Model?

We had a xerox copier that stopped copying once the drum hit some preset limit. However, it automatically reset when it detected a new drum being inserted. You may need to contact the global service center.

I would think this is documented as part of the drum replacement instructions. I'd check the owners manual or whatever comes with the drum.