self induced 4.8is air suspension issue

[titan silber]

So, I probably should have left well enough alone... all seemed to be working fine with no fault codes. I decided to have a play with my Foxwell 520 and ran through some of the tests. One of the tests seems to have failed and the tester said “The following is now stored in the fault code memory. Replace Y20 Air Supply System as pressure relief valve is not OK”. Strangely there’s no fault registered in the ECU but all three LEDs in the switch flash when the car is started. Any advice? Is there a way to reset the system?

If it needs fixing I probably broke it...