I have replaced the t 15 cell and now have a problem with the controller. My led's aren't lighting and some of the readouts on the lcd are reading 0. when I press the diagnostic button these are the readings I get in the order they come up. 0 then 70 (temp), 7.7 for the volts, 0.00, 33p, -0, AL-1, r1.40. I don't know why the voltage would be 7.7 instead of around 25 and 0 for the amps which should be around 7 and o for the salinity. I have read other threads on this forum about a common problem of a round black pice on the circuit card being burned out and sure enough on my board I can see where this is soldered on shows it has over heated so I suspect it is at least part of the problem. Does anyone know if this could also cause no led's to work or the zero readings on the lcd display. When I replaced the t15 cell and powered up the system and thought it wasn't functioning right I unplugged the multi connector going from the cell to the controller with the power still feeding the controller. Could that damage the circuit board?