NEW YORK/FRANKFURT (Reuters) - Lawyers for Credit Suisse last week re-interviewed a former bank executive who said the Swiss lender had her followed in New York, according to a person familiar with the matter, weeks after the company dismissed her allegation as baseless.Credit Suisse asked lawyers from Zurich-based firm Homburger to speak again to Colleen Graham, who worked in the United States for a joint venture half owned by the bank, about her allegation that she was put under surveillance..