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First step is to drain and drop the pan. Let us know what, if anything you find in the pan. Then we'll go from there. Didn't think about the sealing rings, but most sealing ring failures cause slipping/ failure to drive at all.

Sounds like the trans is having a valve body issue. Possibly a failed solenoid, and possibly a valve body gasket has failed allowing fluid pressure to bypass one fluid passage and apply pressure to another, causing a hydraulic lock of the internal components. Seen it happen on every other brand...