Apple will replace the main logic board in affected MacBook Air units, free of charge. Apple will also send an email to affected customers to let them know that their notebooks are eligible for a main logic board replacement. Apple did not provide any specific details or symptoms pertaining to the “issue.”
2018 MacBook Air owners can visit Apple’s support website to schedule an appointment with an Apple Store or Apple Authorized Service Provider. When the serial number of an affected MacBook Air is entered into Apple’s internal repair system, a message will direct technicians to replace the logic board.
Apple will authorize coverage within four years of the MacBook Air’s original purchase date. If the notebook has accidental damage that the customer does not want repaired, technicians are instructed to proceed with the logic board replacement at no cost as long as the damage…
https://www.macrumors.com/2019/06/29/2018-macbook-air-logic-board-issue-free-repairs/