No bulletin is needed since your vehicle is still covered under the 3/36 New Vehicle Limited warranty. Your CPO warranty hasn't started yet. The only way I see that you can be responsible for the cost of the fluid change in this situation is if you failed to change the fluid when code 3 appeared on the Maintenance Minder. We know from owner reports that code 3 typically first appears closer to 45,000 miles then about every 30,000 miles. The transmission fluid life is calculated based on actual driving conditions. If the previous owner did a lot of towing or abused the vehicle, it's possible that a transmission fluid change was previously prompted and not performed. If the previous owner kept resetting the oil life before it reached 15%, they would never have known it needed a transmission fluid change because the MM only prompts for maintenance once the oil life is allowed to reach 15%.I've got a 2019 with 26K miles that I purchased 4 weeks ago that I took in to dealer today for the trans judder issue that has been occurring since the week I brought it home. Dealer verified judder on test drive and is "recommending" a trans flush to be paid by me for $132. Dealer said tech "did not find any bulletins related to 2019 model year," so that this point they "recommend at trans service." Since there is no TSB 17-025 or TSB 17-026 related to 2019 model years, am I out of luck trying to get this covered by Honda, even when I bought the vehicle as a CPO?
$132 is suspiciously low for a 3x flush which requires quarts of fluid at $8.25 per quart and 1.4 hours of labor (typically $150/hr.). Normally, this is a $300 job (which you can do yourself for $82.50 except you don't have the ability to reset the transmission fluid life in the Maintenance Minder like the dealer does).