Apple have today released a replacement program for certain MacBook Air's from 2012 which have been identified as having an SSD drive which is prone to failure.
Models affected are Mid 2012 MacBook Air 11" and 13" manufactured between June 2012 and June 2013. A further test is required to check if your SSD will need replacing, this test is done via the MacBook Air Flash Storage Firmware update v1.1. The update will direct you to an Apple web page giving you options if your drive needs to be replaced.
64B and 128GB drives are affected.
If you are affected and in the Lancaster/Lakes area then Ubertechs Ltd are fully equipped to replace your SSD.