I agree with musicrab, I don't think the fan broke up. Hopefully the bearing remnants should still be there. The bearing is a high speed thrust bearing with a split inner ring race. The inner race is attached to the very rear end of the fan stub shaft and rotates with fan. The outer race is attached to the cylindrical cone and doesn't rotate. The split inner ring allows for some axial movement of the fan stub shaft forward or aft which occurs during acceleration or deceleration and at the same time, avoids putting undue pressure on the ballbearings as the overall bearing distorts slightly. If the bearing fails, the precise centering of the shaft connected to the fan is lost and IMHO, from there on all hell can break loose which appears to be what happened. Examination of the LPT module will give additional failure information.