I have a Hayward TCELL 940 which appears to have stopped working. Showing 0 salt when last week it was 3000. If I am reading the serial #correctly I should still have a month left on the 4 year warranty. 4E19184. My first cell lasted 12 years so this is a big disappointment. I am unable to locate a receipt but I know it wasn't from an authorized reseller. Is there any recourse here to get this covered under warranty? I can't believe the cells are now $900. I think I paid $400 maybe for this one.