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B738 ALT HORN sounds for no apparent reason

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Need some help!!!

Im in the Boeing 738 flying YSSY - NZAA @3500 ft. The cabin has been properly pressurised and the aircraft is flying below 350 IAS. After about 5 minutes flying at cruise speed and altitude, the first officer’s ALT HORN sounds and doesn’t cease. Because I’m using the X-Plane 11’s B738 the ALT HORN CUTOUT button isn’t clickable. Any ideas???

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