Does anyone know if the power supply in a Tivo HD (160Gb model) is compatible with the previous Series 3 OLED model? They appear identical in size/shape/form factor and have the same connections (motherboard/drive). The caps are arranged slightly differencty. I acquired a Series 3 OLED with a bulging cap in the power supply. I have access to an old Tivo HD for parts. Can I use the HD power supply in the older Series 3 assuming it physically fits exactly? Thanks.