[Chris Fultz]

Start with a brianstorm of everything on the robot, and then rate items and systems by what is most important, and then question everything. To lose that much weight, you may need to drop a whole system or motor set.

Try to get an idea of the weight of the components so you know where the big hitters are.

Good targets (in addition to the ones listed above) -

CIMs
Pneumatic pump and related hardware (if you only use a few pneumatics you can create a system that does not need the pump)
Reserviors
Smaller chain (can you go from #35 to #25)

Good luck - and i am confident you will find help at your regional.