Here's the schematic and also the layout that shows the traces and the parts locations. This is for the Ultimaker 3 but this board is basically identical to the S5 but the S5 board is about 10mm wider as the S5 has a wider print head because it has larger rods going through the head so you need to make room for that.
https://github.com/Ultimaker/Ultimaker3/tree/master/PCB files/2012-K Print head PCB
I think every part e.g. q1, q2, q3 is in the same location and serves the same purpose. I've used the UM3 schematic to solder wires to the S5 board so I know they are very very similar. Now that I think about it I probably do have an S5 schematic but I don't know where.
Instructions plus pictures and video for taking the S5 print head apart:
You can also choose to order just this circuit board. Contact your reseller. It looks like you are in Canada so the best place there is probably shop3d.ca - contact them to find the part number for the circuit board in the print head for the S5 and you can order it through them. It may take a few weeks to get it though!
BY THE WAY - this fan only comes on when either core gets above 60C. Did you heat the print core up before deciding it's broken?
oh that sucks. Are you good with soldering surface mount? I can post the schematic. The controller is in the print head itself. There's lots of great explanations out there with pictures of how to take it apart and get it together again. I think it's a darlington transistor - I think maybe a 3 pin device if I remember right. I'm guessing with the fan stuck for so many days/weeks/whatever that maybe the transistor blew. This is not common on the S5 but was common on earlier printers like the UMO (ultimaker original). I'll go find schematics and so on...
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