Whatever the cause, US government investigators continue to unearth poor investor advice tainted by possible conflicts of interest at major investment banks. While Merrill Lynch, Goldman Sachs, JP Morgan Chase and CSFB were busy touting Enron shares as buys or strong buys, a handful of independent research analysts raised red flags. Computrade Systems and Alpha Equity Research advised clients to sell when the shares were in the $50-to-$60 range, long before high-profile analysts changed their views.