Hey! My macbook pro 15" (mid 2015) was affected by this ssd problem.
Fist it was only 9 dead sectors on SSD (and i reinstall MacOS because os wan't boot at all - maybe system area was corrupted), than it changed 95 dead sectors and after that i installed this "magic" ssd firmwire fix from Apple...... so aftter 1 hour i got the 96th bad sector.
My SSD power on hours: 87 hours.....
It looks like Apple uses their customers as hardware testers
Is this a warranty case ?