There is no serial number, only a date code, it is stamped on the side of the motor block under the front cover, basically on the side of the pentagon shaped piece in the middle of the motor block that holds the motor coil.
Where to send it will depend on where you bought it. We receive no compensation from the factory for repairs beyond the part so every distributor is responsible for only what they sell as the profit from the original sale is the only compensation for labor and any shipping. If you bought it from a dealer in Canada it needs to got to Xenia. If you bought it from a US dealer it needs to come to us, however we do not pay return shipping outside the US and there can be additional charges from the shipping company for customs and clearance.