This works on my 55807 and so I'm thinking it will work on the 907. Give it a try.
Set the Layer Switch at the top of the Mitsubishi Remote to TV.
Press and hold the POWER button, and while holding the power button enter 090.
Now the remote functions like this:
Power - Power On Only
Stop - Power Off Only
Pause - AV Reset
Pressing INPUT followed by:
PIP - DTV
1 - Input 1
2 - Input 2
3 - Input 3
4 - Input 4
5 - DVD / Component 1
6 - Component 2
SQV - Input STB
QV - Input VGA
PIP CH Up - Antenna A
PIP CH Down - Antenna B
When done, press and hold the POWER button and enter code 000