We’ve asked Apple for comment. The company has asked at least one owner to send their system in for service, while another said Apple’s engineering team was aware of the problem. For now, at least, you might want to hold off on updating your older 13-inch MacBook Pro.
There’s no certainty this affects everyone. It’s a potentially costly headache, though. The known affected Macs are all well out of warranty, even if you bought AppleCare. While there’s a chance Apple might cover costs in the future, you could be facing an expensive repair or replacement if you need a working system in short order.