AQua Rite Flo Switch Bad?

[Brando]

I am curious, what makes a glx-flo switch go bad in an aquarite?
What is the mechanism that closes and allows current flo?
Suddenly today i am getting a flashing "no flo"
I pulled it and it has some build up grime, ,very fine which i rubbed off with a finger, reinstalled, no change.
If i pull the plug from the bottom of the control unit it goes solid red.
I took the switch out, plugged the switch hole, same red light with it plugged in, when i press the metal flap to the (appears plastic) arm it start to flash, but never( held for 3 minutes) goes solid or goes away.

 

[Brando]

Update, just before i wrote that post i had removed the switch and used a 240 sandpaper to sand down the contact area on the arm and clean(polish) the contact side of the metal switch arm.
turned it on and came in.
when i finished the post i went back out, flow light was off and generating lights were on.
Cleaning the cell now, hopefull all continues to work.