Fish ID from Revillagigedos

Took a trip to Socorro and surrounding islands, aka Revilagigedos Islands and saw this fish. I have no Mexican Pacific fish ID book so was hoping for some help. Its not like its a rare fish, we saw plenty of them.

http://www.shiningseastudio.com/Socorro-and-Revillagigedos-Isl/i-2wbtCQB/A

Thanks for your help in advance.

Redtail or Crosshatch Triggerfish, Xanthichthys mento?

Thanks! The pics I find of that look like what we were seeing.