So after another visit by the local authorized service center, he swapped out the cell with another and still got the same low salt readings. Independent salt test readings by the Taylor kit and the Hayward salt meter both come back around 3100 which is well within spec. But Hayward support says that a deviation of 500ppm is "normal" for instant salt reading. I asked what about the average salt reading, he said need more salt. I don't agree because my salt reading has been off since day 1 when I was at 3600ppm and the unit was way lower as mentioned earlier in this thread. It just so happens now with all the rain and splash out it's down to 3100 which is still normal but the system is reading it as 2300/2400 with the low salt warning. I will comply and add some more salt to get it higher but I do not agree with it being the issue. Hayward tech on the phone with my local tech did not seem overly concerned there was no serial number sticker on the cell. He asked the local tech to read the serial # from the front panel.