i've never worked with that brand of lighting before, but usually with christmas lights, the are all interlinked as a loop circuit, so the first one that is out is usually the cause of the problem... as the link cannot carry on further than the busted bulb. i'd try and replace the first dead bulb, or if you can't find replacements, you could try just linking the connectors by shorting them and taping it up so the rest of the lights can be turned back on.
But thats just a suggestion, as i don't have much lighting experience