How do I disassemble an aerus model C153A Vacuum Cleaner? My Vac Cleaner shuts off quickly upon powering it on. I am presuming a jammed motor or broken (and entangled) belt, or perhaps a thermal overload is shutting it down. I am unable to open the case to inspect. It seems like it's manufactured with snap together parts, and I'd like to know where to press to release the case pieces.