Repair Bobblehead is a Fallout 4 collectible item, which increases the duration of your fusion cores. It makes these Power Armor fuel cells last 10% longer, and the description that pops up when you grab it says “Why go down with the ship when you can try to fix it?”.
If it’s other bobbleheads you’re looking for, to improve your skills, swing by our Bobblehead Locations guide.
The bobblehead is at Corvega Assembly Plant. Look up, at the highest parts of the plant. You’ll see a giant blue sphere with a Corvega neon sign on it (not glowing anymore, obviously). The bobblehead is on a crate on the catwalk that goes around the sphere.
In order to get up there, you’ll have to enter the plant, go to the upper floor and exit onto the catwalk.