Originally Posted by
The Sultan
https://www.hqmc.marines.mil/Agencies/USMC-FOIA/FRR/
In short. Weather acceptable. Crew deviated from planned routed. Conducted extreme maneuvers close to the ground in confined area while filming flight with a GoPro. Hit side of valley. Conclusion: Pilot error.
That report is hardly in-depth or doing justice to the crews that fly the V-22/MV-22. The posts on the military forum give a bit of the concerns I have with the superficial extent of that report.