I think the chances of any mutual fund investor losing money from a Vanguard fund managed by Wellington are so remote that its silly to worry about it, even if Wellington management did something illegal.
This thread borders on financial porn.
Also, this is not the first time:
S.E.C. Mutual Fund Inquiry Widens to Include Wellington - New York Times
That was 2004.
Now if I had money invested somehow with Wellington Management Company, LLP, that would be a different matter.