Chapter 9: Megatron Returns
1: Once Megatron is whole, blow open the door and there will be some prison cells on the other side. Use your hover to go above the second cell on the left and find the log there.
1: Riot Cannon
Just after you pass the large golden Starscream statue, you will come to a room where the blueprint will be in a dome. It will retract as you approach it, allowing you to take it.