Does anyone know for sure if you can upgrade the amount of memory in a Diskstation DS418? More than the built-in 2MBs? I don't think you can but want to make sure. Is the RAM soldered onto the motherboard, or can it be replaced with 4MBs or 8MBs? My clients wants to use it for remote access (Drive) but they bought it, not me, and that is what they picked, so they might be stuck with 2MBs.