Probably the hardest part will be opening the enclosure to get at the location. Thermistors are generally small solid state devices that look like a black match head with 2 small wires coming out side-by-side. Get the part form Linn as all are not the same. You will probably have to solder it in. There's no polarity. Just make sure it is exactly in the same position as the one taken out with regard to the transistor or whatever device it is measuring. It acts like a thermometer whose resistance changes with temp. Position is important if it is to operate properly. Of course, it is possible that it IS working properly and the amp is not adequately ventilated or is being worked too hard over a long time period, or both. Good luck.
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