Remove the vent to see if water is coming from the inside or if it sweating on the face of the register and is dripping.
Sometimes you will have dripping and the water seems to come from nowhere. The ductwork is dry inside and outside.
When that happens, either you have increased humidity hitting the cold register or colder than normal airflow. The symptom typically shows up at one grill.
I'd check the airflow first. Check the filters to make sure they're clean. Many Rheems have a plastic screen filter in the base of the unit that comes from the factory. If it was left in there and external filters are used on the unit, the plastic screen will clog after several years of operation. This clogged screen will slow airflow enough to cause many different symptoms including dripping from the grill.
If that's not your situation, then call a service company. You could have several other causes for slow airflow or something I'm not thinking of. Sometimes nothing can replace a visual inspection and evaluation of a system by an experienced professional.
“I am for doing good to the poor, but...I think the best way of doing good to the poor, is not making them easy in poverty, but leading or driving them out of it. I observed...that the more public provisions were made for the poor, the less they provided for themselves, and of course became poorer. And, on the contrary, the less was done for them, the more they did for themselves, and became richer.”
― Benjamin Franklin
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