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If they find an issue, how much would it cost to replace the speakers ? Is it possible to replace only the speakers without replacing the other internal parts
 
I had my speakers fixed by a UK company known as iRepair Macbooks Bath, the left one had blown and the right was distorted they fixed the pair for £45. They did them last year and they are still perfect! https://iRepairMacsBath.co.uk/ if you wanted to know. 5 stars!
 
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