Well I wouldn't have guessed it, but I went in again and tried to "extrapolate" the D/Green button hex code from the A/B/C codes and it actually worked!  I frankly think I just got lucky; whatever, here it is for anyone that needs it:

0000 006C 0012 0012 0008 0023 0008 0043 0008 001D 0008 006E 0008 0033 0008 0033 0008 002D 0008 0068 0008 01F3 0008 0023 0008 003F 0008 001D 0008 001D 0008 003D 0008 002C 0008 001D 0008 001D 0008 0C45 0008 0023 0008 0043 0008 001D 0008 006E 0008 0033 0008 0033 0008 002D 0008 0068 0008 01F3 0008 0023 0008 0069 0008 0048 0008 001D 0008 003D 0008 002C 0008 001D 0008 001D 0008 0C45

Again, this is for a RNG150N box using the XR2 U2 remote.  I'm still interested in a My DVR button shortcut if anyone has any ideas...