Welcome

Now give it to me for a present and then I can be happy and you won't have to worry about it.

I would change all fluids. including the brake fluid. Replacing the tires would be very smart.
I would look at the clutch fibers and metal plates. Sitting for a long time the fluid will leave the clutch fibers causing them to stick to the metal plates. Even though you said the person started it monthly I would check them anyway. If the fibers are frayed or seperated the debree is circulating thru your oil system.