You might try searching https://visforvoltage.org/
There were several versions of controller depending on year, so some information may not apply.
If you could get a good picture of the other side of the board, especially the area around the microprocessor, we could see if there is something obvious.
Replacing the whole controller would certainly work too, and if it's a brushed motor the controller should not be super expensive. Golf cart controllers like Alltrax or Curtis are pretty easy to set up and can often be found on the used market.