U.S. Embassy Phnom Penh has a requirement for a vendor to provide the technical and professional service of installing and replacing spare parts for the overhaul of AVR Tier III of the Electronic Volt... U.S. Embassy Phnom Penh has a requirement for a vendor to provide the technical and professional service of installing and replacing spare parts for the overhaul of AVR Tier III of the Electronic Voltage Regulator (EVR). Tier III Preventive Maintenance (PM) parts will be provided at the expense of the U.S. Government at U.S. Embassy Phnom Penh in Cambodia. Please see attached request for quotation.