Moody’s Investors Service said the proposed rehabilitation plan to deal with Ambac Assurance Corp.’s segregated account of high-risk insured assets is a credit positive and, if confirmed by the courts, will put the Wisconsin-domiciled bond insurer “one step closer to an orderly run-off.”

Ambac has not written new policies since June 2008. It was a triple-A rated insurer before its portfolio imploded from guaranteeing toxic mortgage-related ­assets.

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