A fledgling engineer must venture into space and repair their spaceship before it ceases to function.

Along the lines of Mike, look to highlight the hook or irony. And, yes, the stakes in the logline should be more than the loss of the ship.

I find the short logline formula only helps at the very first stage of fleshing out the idea. Try in the next take to paint more of the picture.

Who does “their” refer to?

Is this set in the present or future? Operating from Earth or another planet?

Who or what is the antag?