That is not a guarantee, of course, but Apple is sending out emails to customers who own a potentially affected MacBook Air. According to Apple, the issue with the logic board is present on "a very small number" of 2018 MacBook Air models.
It is not clear what the exact problem is or what the symptoms might be, only that an issue exists, according to an internal document that was seen by MacRumors. In theory, when an employee enters the serial number of an affected MacBook Air into Apple's internal repair system, a message will pop up directing the technician to swap out the logic board.
Assuming the information is accurate, Apple is supposed to authorize coverage within four years of the original purchase. Employees are also supposed to swap out the logic board even on MacBook Air models that have accidental damage, so long as the damage does not interfere with the replacement.