The differential pressure level gauge in the high-level tank experiences large fluctuations. I wonder if colleagues have encountered the same issue

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Here’s what happened: The high-level tank is equipped with two level gauges – one is a flap level gauge and the other is a differential pressure transmitter. The level shown on the control panel fluctuated greatly, ranging from 3.78 to 4.08 meters; an alarm was triggered once the level dropped below 4 meters. The instruments on site indicated that the plant should be shut down, as the ball valve couldn’t be closed properly. And what worries me the most isn’t this; it’s the actual level of the liquid. Everyone knows the function of a surge tank – it’s used for pressurization. The liquid level relative to the other high-level tank is 5.12 m. I can’t stay calm at all; I’ve done some analysis on it. I hope fellow users can help with the analysis: 1. Is the differential pressure transmitter damaged? Are there any signs of that? Is the liquid level fluctuating greatly? Is the pressure at the positive pressure port or the negative pressure port unstable? I’m not sure about this 2. Regarding pump issues, if the impeller is malfunctioning, it can be detected by listening to the sound, but there are no abnormal sounds! 3. Motor problems: How can we determine if there is a motor issue? Is there significant current fluctuation? (Perhaps it can be determined by reversing the pump, but please provide more detailed explanations; thank you.) Also, how should this be handled? What should be done if the actual liquid level is indeed low? Have you colleagues encountered this before?