Although Sony and Nvidia opened a joint investigation last year, neither found evidence to suggest that Vaio systems were affected by the packing issue which plagued other PCs. Sony has now changed that stance, and has offered up a list of models which may have the flawed GPUs. They have decided to eat the repair costs for all affected models during the first four years following the purchase date.
Sony has named models in the FZ, AR, C, LM and LT lines as being affected. You can check out the official knowledge base article on Sony's website for a more detailed description and list of models.