On my previous gv I owned I did similar to the centre console heated seats. When you say the leds have blown, are you on about the orange illumination to show seats are heating, or the green glow the 'bar' lights up with when lights are on? If its the orange leds then firstly that's very odd, as they are led I'd not expect them to blow, especially all of them, makes me think something else faulty. If you mean the green illumination, then that's the larger blue capped BULBS (yes you read right, filament bulbs!) the are soldered to the board. What you can do, which is what I did, u solder these bulbs carefully and replace with leds. All you need are 12v green leds with reasonable intensity (unfortunately leds are more directional than bulbs so their glow isn't the same). You then have to use a multimeter to find the positive rail that feeds the old bulbs and solder your led replacement on. Drop me a line if you need more info, but if you're OK with multimeter and soldering shouldn't take more than half an hour