SMC Low Alcohol light comes on, tank is full

[gordyzx9r]

I have one of the 1st generation SMC alcohol systems and the low alcohol light just started coming on even though the tank is full.
The alcohol system is working fine otherwise.


I just had a bunch of work done and the engine was pulled in/out a few times so I'm wondering if they might have inadvertently snagged a wire or something.


I have the original instructions but it doesn't cover the "low alcohol" warning or have a wiring diagram.

[gordyzx9r]

Ground is good.
 
 Float moves freely up and down and goes into up position normally when it's submerged.
 
 I contacted SMC via email and was told that they do have float switches available. 
 
 How difficult is it to change that out?  Nothing on this car is easy, ever...