Sorry for posting this so late after the original topic, but in case you are still looking...
To write the changes that you've made via the service menu (RAM) to ROM, so they are persisted, Press [Degauss]. The display will show 'WRITE'; ensure that it does. Press [Degauss] again, and the settings will be written. Note that this will write ALL changes, not just the currently selected service menu item. DO NOT power off the monitor when writing is in progress,
If you would like to read what was saved (after making changes, but before saving..) press [Blue Only]; this will cause the settings in ROM to be read to RAM (undoing any adjustments you have made). You can also tell if the current setting matches what is in ROM by the ">" indicator by a specific value.
Hope this helps.