Clear in and click the switch on the bridge over the fire to activate a shield which will prevent additional clockwork fliers from coming in. If you do not do this then the clockwork fliers will continue to spawn and attack you.
To open the door, click the switch in the adjacent one-room.
Once the door opens, kill the named.
Go down to the Power Plant (discovery exp). The deactivated clockworks along the way will activate and aggro as you walk past.
Clear the room and click the switches (located up on the top part of the landing facing the cells, go up the ramps), to kill the power cells. The combination to make the cells targetable is as follows:
A = down, down, up, up
B = down, up, down, up
C = up, down, up, down
D = up, up, down, down
After you destroy each power cell a group of clockworks will enter the room from the hall. The order is:
First power cell destroyed: 1 flying clockwork, 1 walking clockwork
Second power cell destroyed: 2 flying clockworks, 1 walking clockworks
Third power cell destroyed: 2 flying clockworks, 2 walking clockworks
Fourth power cell destroyed: 2 flying clockworks, 2 walking clockworks & The Crimson Vanquisher
Some people recommend fighting them from the back of the room as the flying clockworks will separate from the walking clockworks. If your group is strong enough you can just fight them in the center of the room.
The Crimson Vanquisher is particularly hard - possibly the hardest mob in the instance. He has a fairly long (15-20 sec?) AE stifle debuff. The debuff is elemental damage based (heat/cold) so use any buffs you have to help resist it.
Now fight up to the Kings room (discovery exp).
Fight King once and he will run before he dies and turn into a bigger and tougher king.
Kill the new enhanced King and he drops a gear.
Kill Master Protocol - at a certain point (10-20% health remaining) he will begin taunting you which I believe is when he activates his shield. Use the Energized Clockwork Gear at this point in order to finish killing him.