Yes it shouldn't take long to find out what cause the failure. I read up on the British Airways similar incident in 1990, that was caused by bolts of the wrong size diameter (undersized). The installing mech claimed that he installed they same size bolts that he took out, which turned to be true, although they were not the proper size called for by manufacturer.
This China incident was followed by visual flight over high terrain with sub freezing temps and no NAV/auto.
Awesome job of flying it back safely by the Capt. & crew.