A few people have had issues interacting with different points so it's worth knowing the following.....

Eating - Interact by starting to eat, then you have to wait until eating is complete for it to take effect.

Shield - Interact and the value increases as you continually repair by not leaving the repair point.

Life Support - Interact when damaged, repair will take a set amount of time and when repaired it is fully repaired.

Engine - Interact and the value increases as you continually repair by not leaving the repair point.