I never did unplug the unit. Once I figured out it was an LED and not a bulb, I just re-installed the thing without fixing it yet. I have read that the plug is either further inside the spoiler or into the actual barn door (but I would suggest you research further before taking it apart).
Before you buy anything, you should really unplug it and test the LEDs by supplying it with 12V and verifying that it doesn't illuminate. I only say that because you might have a wiring issue that is preventing the LEDs from illuminating. LEDs should outlast the vehicle itself. I'm not saying it is impossible for an LED to fail, but it is unusual, especially if it's a quality LED.
BTW, does the spoiler use a series of LEDs in a row, or is it a single LED?