[Elecraft] KX3 - Missing ATU DATA Menu Item

[krug261 at yahoo.com]

The KX3 has two antenna memory sets: Set 1 (presumably for Home) and Set 2 (for somewhere else). These are selected by menu item ATU DATA. That feature was added in MCU 2.76 / DSP 1.50, 4-27-2017. I took my KX3 (#9842; up-to-date through MCU 2.90 / DSP 1.52, 12-10-2017) remote and changed to Set 2, as I have done several times. When finished with the session, I switched back to Set 1 and powered down the unit. When I got home I decided to double check that Set 1 was activated. Instead, the ATU Data menu item is no longer there. Instead, where it should have been there is now a N/A and recurring intermittent beep. 
The KX3 ATU appears to be functioning properly. It is connected to the KXPA100 with its own ATU, but I tuned the KX3 ATU with the KXPA100 in Bypass. All seems well except for the missing menu item. So, what is the easiest/safest means of bringing the menu item back? 
1) Download my last configuration file?
2) Hit the "Send All Firmware to KX3" button in the KX3 Utility?
3) Other?
73 and thanks,
Bob, KA2TQV