Modulators are long gone -- the computer that controls this transmission (as
well as the engine) has all the information already.

To me, the reason that Ford no longer installs dipsticks is simply improving
its dealers' bottom line. With all those imported hybrids coming from Japan,
those poor guys can't many any money selling domestic product, so they need
an incentive to stay in business. How about deleting the engine oil dipstick
and drain plug too? Wouldn't that be wonderful? You want your oil changed,
sir? No problem, we just need to pull your engine out and drop the pan. That
will be $1250...
For sure, some on this  group will come with other reasons like the average
owner having no clue how to check fluid level and causing damage by
overfilling. What can I say? Driving requires a lot of skill; perhaps we
should all hire professional drivers, all employed by the dealership?

If you don't see any drips under the vehicle and there is no oily gunk
floating in the coolant, it's probably not low on fluid. It could be as
simple as the filter getting loose and starving the transmission or a bad
pressure regulator. If it's persistent, there will be a code set. You can
read those yourself or go to a place like Autozone that does that for free.
But there is virtually nothing the owner can do with the resulting
information anyway. If there is a transmission business in your area with
good reputation (rare, unfortunately), I would head there instead of the
dealership.