Oil & Fuel 3505 transmission fluid level check

[Davebest]

I want to check the level of the transmission fluid in my 3505 DI and expected to find a plug on the side of the transmission case. I've only found two plugs, besides the fill/vent plug on top. Both are on the bottom of the case, one is in front, and the other is at the rear under the PTO. Shouldn't there be a plug in the side? Is the front plug the check plug? The manual is worthless as to the check plug location. It also calls out 7 gallons of fluid in the transmission, doesn't seem like 7 gallons will fit if the front bottom plug is the check plug.