I would just chime in that this pump dying is very unusual. I can't say I have encountered a dead 1073.008. The most common issue is a broken or jammed impeller. Be sure the magnet is free to spin on the shaft, calcium and debris can fuse it to the shaft and stop the pump. Also, you should have only an impeller and shaft with 2 black rubber bushings. If you have an extra grey washer for example, that is a piece of the impeller that broke off and as a result the magnet can turn without engaging the impeller. I would test the pump stand alone in a bucket, this way you can be sure it doesn't work, another possibility is the pump is fine but the venturi is clogged or damaged and cannot take in air.