John,
I believe you have a receipt from the name of the store you bought it from off of ebay .....right? So, you don't just say I got this from ebay...you say the name of the store....ebay shouldn't even come into play. The unit was new, unopened, NOT re-furbished...right? If that's the case, Numark has to ( by warranty law) repair the unit as long as the warranty has not expired. Also, when you get it back, I believe the warranty is extended from the day of repair to encompass the original length of the warranty. ( 3, 6, 9, 12 months etc.)
Keep me posted and good luck,
Donny "B" 8)