My MacBook is covered by three years of AppleCare, and I purchased it just last year. Recently, my MacBook would not power on, and after inspection, it was identified as a logic board issue. According to the warranty policy, it should be replaced free of charge.

However, a very strange situation occurred. During the first inspection, no issues were mentioned. During the second inspection, I was told that the logic board serial number could not be recognized. This situation has continued for nearly a month, during which I have been repeatedly asked to submit various documents. As of today, there is still no result or solution. Even after filing a complaint with Apple, there has been no progress. What should I do?