Service Mode "Menu not Exist" Android 4.1.2
You need to revert back to Jellybean 4.1.1 to get the extra options under (6)NETWORK LOCK as far as I'm aware.

Like you said there should be 3 other menu options under (6)NETWORK LOCK and they should appear after reverting back to 4.1.1.

You will need the 4.1.1 firmware for your current carrier and Phone model and (Odin) to flash the firmware.

Make sure you save the original firmware first, so if anything goes wrong with the firmware flash, you can revert back to the original firmware.

Hope this helps :)