Looking for a bike shop in Orange County, or south L.A. to do a tuneup.

My first road bike has about 4k miles on it, and the drivetrain is noisy, I am getting some misshifting, and there are small parts I cant clean properly. I've only done basics like degreased and lubed the chain, cleaned the gears, and the frame.

Looking for a bike that can disassemble the drivetrain, clean the parts, and reassemble it, and make any proper adjustments.

I live by a performance bike shop, and REI, but I know there are better choices for bike labor out there.

Let me know your suggestions. Thanks.