Start with basics.
First, congratulations on completing BRC2!!!!
Now on to the cooling fans. They are a "dumb" system in that they are not computer controlled. Power goes to the temperature switch in the left radiator (if I recall correctly) and when it reaches a certain temperature it sends power to the fans.
Start with checking each connector to be sure the wires are fully inserted and the pins are not messed up. You might have to relocate the fuel tank, not necessarily remove it, to access all the connectors.
If connections are good, then you will need to test the temp switch itself.
If it was only one fan not running, I would have suggested checking only that. Since it's both, start with common power source.
Good luck.
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