Instead of replacing the fans completly, you may be able to repair them.
Once you removed the fan, there is a screw that you not yet have to touch. Unscrew it and carefuly open the housing. After that, you can pull the fan wheel with the shaft out. Clean everything (avoid water), including the hole that holds the shaft. Put a drop of oil (10W-40 syntetic motoroil works pretty well) on a piece of tissue and oil the shaft. Reasseble the whole thing and check that it moves.
This may not work if the mechanical damage is too extensive or when the electronic is broken. If it works, you spared 50 bucks, otherwise the nice folks at ifix can help you out ... I did this to both of the fans after they got rather noisy, and they worked another two years since.
Tried that. Rather helpful, but a few suggestions.
Step 18: I would suggest to avoid losen the screws that that fasten the heatsink to the board - unless your intention is to really replace the board or the thermal paste. It is possible to get the board in and out with the heatsink attached, but you may have to remove the fans first. Do not losen the five srews marked red towards the back.
Step 19: the mentioned coloured cable is not always coloured (it is not in my model), do not mistake that cable with the cable to the battery, which is also couloured and also connected to the bottom of the board. It may also be better to remove the left speaker assembly and the WLan card to get to the other end of that cable and disconnect it there.
Lorsqu'il en aura reçu, il pourra afficher un graphique de sa réputation au fil du temps.
Voici un aperçu de ce à quoi ressemble ce graphique :
Aucun point de réputation obtenu pour l'instant.