Earnings may tell if Wells Fargo made a mistake in buying Wachovia (Asbury Park Press)

Wells Fargo & Co. investors will find out this week whether the lender, like Bank of America Corp., underestimated the risks of buying a failing competitor in the middle of a credit crisis. Wells Fargo, the second-biggest U.S. home lender, will post fourth-quarter results on Jan. 28, the last of the four largest banks to report. The bank may also update the status of Wachovia Corp., the North …