Reward: 300 gold and 4 quest points

To start this quest you need to go to Draynor Manor (North of Draynor Village) and talk to Veronica.

Now you need to go inside the mansion and go to the top floor, here you'll find Ernest (The chicken) and the professor. Talk to the professor, it turns out that before the professor can restor Ernest to his former self, you'll need to find several items for him.

The Rubber Tube:

Look around the rooms downstairs and grab one of the spades, go to the West of the garden and dig in the compost heap, there you'll find the rubber tube.

The Oil Can:

On the ground floor there will be a round table and book cases (I think it's in the West of the building). Search one of the book cases and you'll go through a secret passage. Go down the ladders. This next bit is pretty complicated, so pay attention : P , it's easy to get it wrong even with a guide.

Pull Lever A, pull lever B, go through the North East gate, pull lever D , go through the South West gate, go through the South gate, pull lever A, pull lever B, go through the North West gate, go through the Western gate, go through the North, pull lever E, pull lever F, go through the Eastern gate, go through the Eastern gate, pull lever C, go through the North Western gate, go through the Western gate, pull lever E, go through the Eastern gate, go through the South gate, go through the South gate, go through the Western gate.

Phew, done, you should now find the oil can.

The Pressure Gauge:

Now for the last piece, the pressure gauge. Go up to the second floor and take the fish food, then go to the witches room and take some poison. Mix them both together. Now go to the fountain outside and put the poisoned fish food in the fountain, then search the fountain. There you'll find the pressure gauge.

Now that you have all the pieces you need, go talk to the professor again.

He'll turn Ernest back into human form and your done :)