[Cshelton]

Ah, thanks. I was looking for it. I deleted the main comment because I didn't want a conspiracy war breaking out lol.

But everywhere I did read, the tiles have been a plague on the Orbiter since day 1. And of course the man hours needed to change them was crazy.

[mikeash]

That part is true. Orbiters would routinely come back with broken or missing tiles. Fortunately it was robust enough to withstand a few missing.