Help with how to repair Fisher Price talking James

Well after a good nights sleep I decided to take him apart again and take some pics....
I took the circuit board out of the tender and separated the wires to show on the pics when suddenly he jumped in to life.
It would appear there is a break in some solder somewhere, unfortunatley I dont have a soldering iron so put him back together, amazingly he still works but at least I now know how to repair him fully should he go faulty again.

Thanks
Joe