Some owners of Apple's current-generation MacBook Air might be due for a free but important fix. Reports from 9to5Mac, AppleInsider and MacRumors indicate that Apple has found a logic board problem with a "very small number" of MacBook Air units that will warrant free repairs for up to four years after the original purchase date of a given machine. The company hasn't detailed the nature of the issue or added the Air to its official repair extension page, but the symptoms can include "power," according to 9to5Mac.