Asd 3s159 Link

Are you looking to a specific hardware issue on a 2013 iMac or Mac Pro? Updated! Apple service diagnostics (ASD) reference list

: Some tests, such as BootROM headers or specific display backlight tests, are known to occasionally report false negatives on certain hardware revisions and may need to be manually disabled during the diagnostic run. Macintosh Repositoryhttps://www.macintoshrepository.org asd 3s159

Without more context, no legitimate or useful review can be given. Are you looking to a specific hardware issue