Renault shares slump as profit warning deepens carmaker's problems

PARIS (Reuters) - A profit warning sent Renault's shares as much as 15% lower on Friday, capping a turbulent year for the French carmaker since the arrest of long-time boss Carlos Ghosn and adding to signs of a sharp global auto industry slowdown.Renault and Nissan both announced leadership changes last week, seeking to reboot their alliance which was thrown into crisis last year by the arrest of Ghosn in Tokyo on financial misconduct charges, which he denies. But the companies are struggling..