Good point - here is a tad more detail.

Turn on the 302 and push the button to change the "screen" on the 302
display. 1 is mccready setting,etc. I think you need to go to screen
10, it's near the end. When you get to the right screen, twist the knob
and along w/ showing you things like raw airspeed G sensor reading when
you turn the knob far enough it will say either good or bad seal. You
can get a "bad seal" if the case has been opened or perhaps if there is
some internal electronic fault.

Roy Bourgeois wrote:
Joe:

Go back to the 302 manual. It will explain that one of the screens is a
security seal check. If you go to that screen and it indicates "Security
Bad" the unit has to go back for a repair. Mine did it when new.

Roy B.