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Utility regulators in Maine are being asked by a Biddeford-based phone and internet company to review FairPoint communications’ business practices.In a petition to the Public Utilities Commission, Great Works Internet says FairPoint is overbilling for use of its lines and is threatening to disconnect some of its customers.Maine’s public advocate is expressing support for great works’ petition and has filed a motion to intervene. A FairPoint spokesman says the company is working on its response to the complaint.