The oil pan is usually the issue when you see oil dripping on the opposite side of the motor from the oil cooler. Either way, the pan and the rear main seal both are extensive repairs that take a few days to complete.
If the oil pan is the issue, the entire front suspension has to be dropped in oder to complete the repair. If the rear main seal is the issue, the motor and trans have to be separated before they can replace the seal.
Let us know what the dealer has to say.