I then pulled into a parking spot with the car on in park, and the gear with an exclamation mark came on?

Could a problem be created by replacing old parts with new gasket, filter and fluid? I have heard of stories where transmission services have started transmission problems. I thought I had an oil leak, but my oil has maintained its levels, but I was noticing drops of fluids that appeared to be oil which I believe is transmission fluid. The other day I was going about 45 mph, and veered right into a parking lot, shifted right a bit more to dodge a vehicle backing up and suddenly stepped on the brakes. I then pulled into a parking spot with the car on in park, and the gear with an exclamation mark came on. I noticed shifting problems, then took home and parked it for the day, so I can use another car. Came home later on and drove that night, and the next day without any problems. I am suspecting the fluids are low.

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[Kerry at Pelican Parts]

The fluid can "slosh" around in turns and sudden maneuvers so check the level. Servicing a transmission will remove clutch material suspended in the fluid and fix sticking solenoids but the clutch plates will still be worn from shift and nothing short of a rebuild is going to help

- Kerry