Had a quick look in my owners manual, and the red warning light is that the battery is discharged - the voltmeter might be showing 14.4V equivalent, but that's what it's trying to shove into a dead battery.
I'd be pulling the battery out, and leaving it for a couple of hours before taking it to someone who can put a load tester on it and see what condition it is in; I suspect it's dropped a cell (or 2) and is just about starting the car in Summer as it doesn't need as much for the glow plugs.
On the bottom warning lights:
1) Timing belt is due a change (according to when it was last reset) (j in the picture below)
2) There's moisture in the fuel filter trap that needs to be drained (k)
3) The air filter is either blocked or there's excessive dust in the bottom of it (l)
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