e3300eb16b6f8e5bae9c229bc9332b8b25 February 2013Last updated at 14:46 GMT What is a rating agency? By Rebecca MarstonBusiness reporter, BBC News

Perry's office has told residents it can't offer assistance, citing the investigation. The governor and his staff also have declined to grant interviews to The Dallas Morning News about the issues.

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However, board chairwoman Debbie Branson noted last week that the CEO search has been suspended until Parkland completes the survey by the Centers for Medicare and Medicaid Services. That inspection is ongoing this summer and will determine if Parkland can retain its annual $400 million in government payments.