What if I have been to room 7?

Hint 1 of 11:

The explosion you created getting into room 7 destroyed the generator that
you were using.

Hint 2 of 11:

You'll have to find a new source of power.

Hint 3 of 11:

From something that might appear to have no power at first glance.

Hint 4 of 11:

The proper in room 9 still has a functioning fuel cell, if only you could get
to it.

Hint 5 of 11:

Man alone can't open the door into the fuel cell.

Hint 6 of 11:

But a robot can.

Hint 7 of 11:

Repair the automated worker ("Barney").  The hints on how to do so can be
found in another question.

Hint 8 of 11:

Once you have the worker running, use Scotty on Barney, and Barney will
automatically open the hatch for you.