Booked YYZ-YVR-TPE-YVR-YYZ a few months ago, all in J but last YVR-YYZ segment. J opened up yesterday so I called in. Just got my itinerary/receipt and received a $24.80 refund on taxes, fees and surcharges. Nice! I guess the surcharge went down since I booked. I would have expected them to go up moving from Y to J.