Septic water pump issue

The water pump in my septic system is not working well, two issues:
1. Sometimes the float just won’t trigger the pump, even if I lifted it, do I need to replace it or should I look into something? Sometimes it will work (magically), should I replace it?
If I replace do I just replace the head or I replace the wire as well? The one home depot is selling (http://www.*********.com/h_d1/N-5yc...splay?langId=-1&storeId=10051&catalogId=10053) comes with the wire, that’s why I am asking. Replacing the wire is a little troublesome since the wire is buried
2. Sometimes the float started to work (magically), but the pump will be triggered once a minute or so. The reason is that when the pump stops, water will back flow to fill the tank gradually. I am sure the drain field is still working as most of the water is pumped out, just a small amount of water will flow back every time. I don’t know if it has a one way check valve, should I install one? (I don't know why it wasn't installed originally so wondering if it's OK to install a one way check valve in a septic water pump)

Yes you need a new float switch and they come with a new wire. There should be a check valve so if not then yes install one.

I took a picture:
https://picasaweb.google.com/115164...thkey=Gv1sRgCNmbluDdrcnKywE&feat=embedwebsite

so should I just cut that PVC then intall a check valve? there isn't much room for me to work on without getting down to the tank. Are there flexible pipes I can use?

The alarm also not working, if I know how to do it I would replace the whole thing with a panel which contains the alarm. I called a local company they will charge 239 for simple coming to see the issue...