Mine is all original other than a connector or two I replaced on the GI.
Once I went to all LED though, the draw on those connectors is much less.
Another thing I did was remove the battery holder and install a remote one in the back box. Always do this. To all your games. Unless NIB obviously.
Other than that, my T2 is original everything else.
T2 club is a better place for this question fyi.