(Bloomberg) -- Funds under the UBS Group AG umbrella face more than half a billion dollars of exposure to bankrupt auto-parts supplier First Brands Group through various investment strategies, with one ranking as the biggest unsecured creditor, court documents show.  The auto-parts supplier filed for Chapter 11 protection in Texas late Sunday following a failed attempt to refinance $6 billion of loans and creditor concern over the company’s use of opaque off-balance-sheet financing. The board committee ap ...