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I opened my Optima G4 panel without engineer code and now have a red flashing tamper, Ive pressed reset and still the light remains. The panel is firming closed so not sure what the issue is. Any solutions?

I have the above alarm system, I would like to turn down the voulme on the exit tone, I no it's simply enough to do once the panel is open the issue I have is I do not have the engineer code to stop the alarm going off, is there a way to open the front panel to adjust volume without engineer...