TSB Information?

I have been having trouble with my 05 stang, the gas gauge sometimes goes to Empty and if flashes a code stating Fuel level low DTE FLI DATA ERR and some times it just gives me a wrong reading knowing how much gas is in there.
I found this TSB
http://www.stangnet.com/images/stories/docs/s197_TSBs/06-10-13.pdf
Now does this mean they will fix it for free or there a catch to the TSB thing? My warranty went out 10k ago. I went by and had them check it out and they told me $455 to swap out both sending units. :shrug: The service lady told me there was a TSB but that it only said they required both units to be changed.
 
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Try running a bottle of Techron through it. I read in a similar thread (no idea where now) that the dealer was trying that before replacing the sending units. Apparently that did the trick.