https://www.isoscell.com/our-stock/product/p_2809229
they rebuild and or exchange you controller.
already changed one and going to do the other to have a spare
I believe the mechanical governors are made by HOOF Governors (https://hoofgovernors.com/) they build all sorts for many manufactures of equipment.
had to replace one on a mid ninetys bobcat 742 with ford engine last year. was pricey but is running great now.