Yes, the transmission (eCVT) is a sealed unit and does not require breaking the seal and changing the fluid. The fluid is special to the FEH to decrease drag. Your dealer serviced a transmission outside the FEH maintenance guidelines and may have used the wrong fluid or overfilled or under filled it. There is no dipstick to check fluid levels and making sure the right fluid was added back, so I'd check the repair documents to see if the right fluid was added back if they noted the type fluid. Most dealers refuse to change the fluid and tell you it's a sealed unit.