How to Reset the Drum Life on a Brother HL 4070CDW Printer Menu

Turn on the printer by switching the 'Power Switch' on the bottom right side.
Press '+' or '-' keys on the top front 'Control Panel' to select 'Machine Info.'
Press 'OK.' In the next menu, press '+' or '-' keys to select 'Reset Parts Life' and then press 'OK.'
Select the 'Drum Unit' by pressing the '+' key.
Save the changes by pressing 'OK' twice. The drum life should now be reset.