DC59 red light flashing

[macman]

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I have been asked to look at a DC59 where the red light flashes when the trigger is pulled, and the motor won't start up. Looking at the Dyson online support, it helpfully informs me that a flashing red light with the trigger depressed means 'there is a fault': which I had already worked out for myself...
I'm guessing charger, battery or motor? Best way to narrow these down please (I will check the charger output when I've collected the machine)?

[RustySkull]

I'd check the battery for voltage, and the charger for output, and if those two are okey it must be something stupid as it'll have a Computer in it I'd imagine.