My TKS quantity indication was a bit erratic and now indicates 0.0. There is at least 3 gallons in the tank, as I ran it on my last flight starting with about 3 gallons, and added another gallon tonight to see if the quantity indication would change. No luck. Has anyone else seen this? My guess is that its a simple fix of a fluid level sensor that's gone bad, but nothing with the CAV system ever seems to be simple. And I don't have any documentation or drawings for how the system is put tog