The coolant level sender probes are bonded into the header tank - these ones scale up and cause a false reading, especially when it's cold (and I assume the coolant contracts, so the level drops a bit). These ones give the three beeps on startup and flashing red light.
i had the three beeps and red light with the failed coolant temp sensor (i did scrape the 'prongs' for good measure though)

the coolant beeping not something I need to worry about till the winter but I'll give that screw driver thing a go later on. Will have to see if the parts garage is open tomorrow.
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