There have been several expatriates getting into trouble with Apple Support after they had their iMac's and MacBooks upgraded by a non Apple Service Center.

They will also tell you that the installation has been damaged and/or cannot be upgraded and try to charge you for that. This is in no case legal. All the major computer manufacturers have been forced to either customers to upgrade their computers or install the hardware for free. This is also the case if the customer brings their own hardware. This is why all computer manufacturers now allow upgrades.

Apple states, this is straight from the US, that unless the service partner can prove that the hardware installed is faulty, they have to perform all upgrades and/or warranty repairs for free or normal upgrade cost.

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Apple's warranty states:

"This warranty does not apply...if the product has been modified without the written permission of Apple..."

Adding memory (DRAM, VRAM) or other user-installable upgrade or expansion products to an Apple computer is not considered a modification to that Apple product. Therefore, it is not necessary to obtain Apple's written permission to upgrade or expand an Apple computer. While Apple strongly recommends that you retain the services of an Apple Authorized Service Provider to perform any product upgrades or expansions, you will not void your Apple warranty if you choose to upgrade or expand your computer yourself. However, if in the course of adding an upgrade or expansion product to your computer, you damage your Apple computer (either through the installation of, or incompatibility of the upgrade or expansion product), Apple's warranty will not cover the cost of repair, or future related repairs.