Rev G TIUs have no revision listed on the bottom. Not 100% certain, but I think 10 flashes of the red LED means the TIU is toast. GGG or GRJ can confirm. It 's worth it to buy a new Rev L TUI. They are MUCH better than the original Rev Gs.
BTW, Keep your remote! It WILL work with the new TIU! You will need to up grade the firmware in the remote to the latest version.
Chris
LVHR