MAT,
Yes they WERE IGWs, are now ERs. You seemed implied that either this aircraft was NOT an ER, or did not have Rollers.
RTL= Return to Land.
The Bulletin was issued AFTER and IN RESPONSE to this and several other incidents of TR inner wall failure, so they would have had trouble reading a bulliten that wasn't wrtten yet.
It was a judgement call, and they did their job.