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2009 Hyundai i30 - Seatbelt warning light - galileo

Don't often have rear seat passengers, today someone sat in the left rear seat and the seatbelt warning bleep and light wouldn't stop when she plugged the belt in. After unplugging and trying again the bleep stopped, the light went to half brightness and out after a minute or two.

I suspect there is a bad contact somewhere, any suggestions for fixing this myself or does it mean a trip to the local auto electricians?