NATS warning light 2

https://carkeysymbolblinkingcentral.juniperbrief.com/posts/nissan-car-key-symbol-blinking-what-it-means-and-how-to-fix-it

The NATS warning light blinks red on the flight deck when the aircraft's altimeter disagrees by more than 200 feet between the captain's and first officer's instruments, signaling a potential altitude discrepancy that needs immediate crew attention.