You need an RMA number before sending your Mac/Mac Part to GALAXY for repair. An RMA is automatically generated and emailed to you following receipt of your online order. But for warranty exchanges, product returns etc you should fill out and submit the RMA Request Form.
Ways to identify your Mac and the parts associated with it, follow these general guidelines:
Your computer's Model Identifier and Serial Number are provided in
About This Mac under the Apple Menu. Apple Model Numbers are listed on the sales invoice and printed on the computer's shipping box.
Apple Laptops also have their model number printed on the bottom of the case up by the hinges. Mfg. ID Numbers are printed on the part itself. EEE Code click on the "what's this?" link located by the EEE field name on each product's listing page.
ALSO: See the introductory overviews on individual product pages for model-specific tips and insights.