[Well Luvrbus I knew you would have an answer but somehow this one and only time I didn't want it. As you guess the access hole is covered by the hardwood flooring in the bathroom.
Is the sending unit towards the front of the tank, middle or towards the rear of the tank?
Ouch, hardwood floor, no access. It's been a while since I've been under mine, but it is near the center.
Dang it. I should not have excpected it to be an easy one. Like my dad used to say "Son, life always throws a curve ball at you, but you need to watch the sliders and the fast balls too".