The usual replacement is either an after-market alternative system or an MGR 2-speed/resistor controlled type (2-wires into the motor). Either is plug and play for any old 3-speed and widely considered to be more reliable. However, the low speed resistor should be the recommended 100watt 'gold' type. If the MGR fan system you get has the old aluminium/50 watt resistor, you should replace it. You can get the 'gold' resistors from forum traders, eBay or from electronics outlets like RS Components (UK).
TC
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