Sounds like front pump failure. These transmissions have a small pump in the rear that allows for push starting, so that explains why the transmission seems to work when the car is rolling. Since you'll have the transmission out to replace the pump you might just want to remove the old one and disassemble it for inspection to see if something is actually wrong before $pending hundred$ on a new pump.

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Erich Loepke
2010 Ford Focus
Currently Benz-less