Flashing red lights, power light off

Epson Stylus Photo 1400, both lights are blinking fast, ran WIC reset utility and getting 0x61 PW Sensor/Main Board fata error code. I'm trying to locate the main board but cannot find a diagram anywhere. Printer gave code last night, I left it unplugged overnight, it worked fine all day today and then started with error lights again, so not sure if main board is actually out or something else is going on? I do have another printer to use for board replacement, but need more information or direction on how to replace.