Two WorldCom board members are urging other directors and creditors to fire chief executive John Sidgmore, saying his vision for bringing the telecommunications company out of bankruptcy is flawed and the company should instead be shopping itself to potential buyers. Sources said the board members have met with creditors in recent weeks, seeking their support to replace Sidgmore. One source said a group of creditors and some directors had already interviewed a potential replacement for the chief executive. Shake-Up Sought At WorldCom | 
