Bring a couple of adapters so you can test the TRS inputs too. Also bring something to test each of the XLR and TRS outputs too.
Switch in all the processing and use as much gain as possible so that all the meters light up. The idea is to test all the LEDs (obviously not while you’re testing the physical outs.)
Press all the mute/pafl/assign/post buttons to test their operation and that they light up. Same deal with the buttons and encoders around the touch screen and SuperStrip. Check that the touch screen is responsive; opening up the peq and sweeping around making sure the bands follow your fingers is a good start. Good luck with it.