OLDWICK, N.J.--(BUSINESS WIRE)--Although most insurance carriers in Puerto Rico maintain sufficient capital to support lower bond ratings given their adequate capital positions and manageable exposures to the Puerto Rico municipal bond market, there will be circumstances where rating actions may have to be taken. With this in mind, A.M. Best has issued a briefing that has closely monitored the ongoing credit troubles in Puerto Rico and the resulting impact on insurers domiciled on the island. T