You could always buy a few replacement LEDs from
www.superbrightleds.com and soldier them into where your burned out ones are. No guarantees that they will put out the EXACT same brightness as the originals though? If not, you COULD replace all of the LEDs on the strip if the brightness wasn't exactly the same. OR you could buy a whole new strip and adapt just the string that comes inside it, into your spoiler's location right now. I did something similar on my car when I adapted LED 3rd brakelight into my rear deck. See site:
http://josch.wilksfamily.com/3rdBrakelight.htm 
