(Reuters) – Credit Suisse is in the throes of one of the biggest challenges in its history, hurt by a slump in stock price and the worsening of a key gauge of its credit risk ahead of a planned revamp. The bank is battling market skepticism about its financial health after a string of scandals, months after it was found guilty by Switzerland’s Federal Criminal Court of failing to prevent money laundering in the country’s first criminal trial of one of its major banks. Here are the main crises the bank has faced in recent years: CREDIT DEFAULT SWAP SPIKE Already wobbling under pressure from a d…