To access those menus you need an UltraPAC II (256K or 512K).
UltraPAC-64K does not have access to this feature.

Keypad test. Once each key is pressed 'OK' appears next to it.

Similar to keypad test. The small arrows appear for each trim button that is exercised.

I did not manage to get a response on this screen.
It may be a screen to tests the switches or change the switch type.

Some of the stars appear or disappear as the service menu enabler is removed/reinserted to the transmitter.
It is probably a test for Input/Output ports of the radio.

Another hardware test menu.

These are just horizontal and vertical lines scanning the display to show any dead pixels.