Gents, (and Gentettes)
I have had a set of LS90's for a couple of years, since about 6 months ago, when the power amp is switched on, the left speaker tweeter emits a mid to high pitched squeal. 
the volume of the squeal is relative to the volume of the amp

started only lasting a few mins and then would go away, but now its permanent and un listenable. 

initially i thought it might be the amp, but i swapped the channels over and it stayed with the speaker

What i am suspecting, is either the Crossover, or one of its caps has given up the Ghost, 

Any idea if there is a kit i can use to rebuild the XO or someone locally who may be able to do so (im in west akl)
I would be doing both speakers at once.  

Alternatively anyone got any ideas if i could be barking up the wrong tree here and it might be something else? 

Thanks in advance! 

Axent Audio in Portage Road, Avondale. Can fix most things hifi

Now not certain, is it Avondale or New Lynn?  Definitely Portage Road,  fascinating store to explore.  

Thanks Sub,
i ended up getting carried away and bought up all the kit to build some nice shiny new ones.
its not an overinvestment if you are addicted to something right ?

So I got pretty carried away.
I Am currently building up my monster xo's
Biggest issue is I'm having to move the mounting points for the crossovers which is going to leave me short on cable.

Which I guess means I'm replacing internal speaker cables.

What I should be looking at replacing it with.
I'm running some pretty serious crossover gear
Jantzen z caps and air cores along with 48 core cat 5 speaker cables from amp to speakers so I guess I'd like to keep it in the Same realm of decency

any advice would be appreciated!