Yeah, we did that and the PW guys dont have a clue of what the cause is. And yes! That's exactly what's on my mind right now! So annoying. I'll just fly this thing back to manila and wont fly it til the problem gets resolved.
BTW Bleed valeves were easily solved. You'll find this funny (i did), they cant find out why our engine shuts down when using the bleeds(left) so they sealed the whole thing installing a metal plate. Now we only use ram air, not wanting to stress the right engine further. The itt goes up pretty quickly past 745c, so we just dont use it.