Back when I was an ONT 75/76 guy (as late as early 2017), we were flying the 767 on the SZX-KUL-PEN run. If you were lucky, you got the 80 hr layover in PEN. Good times.
The only place we flew the 757s in Asia was between SZX and CRK...and that was it. Everything else was the 767. Maybe loads have lightened up going to PEN, and they switched to the 75?