Many patches have been released to fix the map scripts and disable the teleporter. Anyhow, here's how the good old maps used to work :
MLB Temple : there is a radio tent close to the allied spawn which has this board nearby
Activate trigger #1 one time
Activate trigger #2 two times
Activate trigger #3 three times
MLB Daybreak : you have to find a board similar to the one in MLB Temple but this time it's located in the last map section (Rocket Base)
Activate trigger #1 three times
Activate trigger #2 one time
Activate trigger #3 two times
