How do you check and add transmission fluid to a 2007 craftsman dgs 6500 garden tractor? also, what type fluid do I add?

I finally took off the body because the pin you pull out in the back was not unlocking the transaxle either. I found two filler holes. Filled them up and it runs fine. Must have a leak though cause I have to fill it up about once a month but it's much less costly than replacing the trans. Now that I know where the filler holes are I can fill them with the body on. I finally took off the body because the pin you pull out in the back was not unlocking the transaxle either. I found two filler holes. Filled them up and it runs fine. Must have a leak though cause I have to fill it up about once a month but it's much less costly than replacing the trans. Now that I know where the filler holes are I can fill them with the body on.

So where are the holes , how much oil and what oil do you use ?
Thank's So where are the holes , how much oil and what oil do you use ? Thank's