unresponsive keys

Good afternoon,

I recently bought a 9630 tour off ebay and the phone works flawlessly and its in very good condition as a whole. The only thing is....the call button,menu button and trackball click tend to get stuck occasionally and don't respond 50% of the time I would say.

I have managed to clean some of the crud from under the trackball with a couple youtube tutorials but I want to see if anyone has any fix for when the Green Call button and BBmenu button get less responsive.

Thanks in advance. All help is appreciated

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