John, If you can't load software and the TIU continues to have random numbers greater than 5, the memory chip has failed. It is a PITA to change and it is very easy to lift traces that then require much more labor trying to jumper back if even possible. Additionally, the memory size matters with other jumpers installed.
In my opinion not worth it on a rev G. But if you want to go for it, call into MTH to get the specifics. I have done it successfully once, and have since decided not worth the effort. G