[quote name='winterfire666' timestamp='1337184057' post='1656846'] jack phillips in bolton fitted my green front and side leds, did a great job, not quite sure of the techniques used but he claims he doesnt need to remove the fretboard. if anyone knows exactly how this is achieved i would like to know too. [/quote]
Look under the underside of the neck. If it's the "Sims" method, a small route is made along the length of the fingerboard. Depending upon how good the job is depends upon how "invisible" the job is. Anyway, this route enables enough space to put in wires. Once the neck has been fitted with LEDs, a small slither of wood matching that removed is inserted and glued into place. A quick rub down and a blast of polyester finish and a final polish... job done.
Have a look - I'd be interested to know if this is the method that was used on your bass.