From past experience, when the USB port on a camera breaks off the main circuit board, the manufacture requires replacement of the board, which can cost around $600 (parts & labor). In this situation, the technician was able to disassemble the camera and repair the connection between the USB and main board. When the camera is disassembled, the technician also cleans the contacts and switches. After the camera is buttoned up, the technical checks all the functions, cleans the sensor and warranties the repair for 1-year. The cost to do this on the Nikon D3 is $290.