I attempted a swap this weekend with a used charger from eBay. The one I received looked like the case had been opened, which made me a little suspicious so I went ahead and opened it up. I saw evidence that one of the power boards had already failed (burn marks on one component). There are 2 40A fuses on each board so I decided to check them. Sure enough, they were blown. Fuses on the other board checked out okay.
Decided to open mine up to investigate since I already had it out. No evidence of a failed component but both of the fuses were indeed blown on one board. For fun, I swapped the fuses from the good board on the ebay unit into mine and reinstalled. Tried charging and both fuses popped again. Pretty sure I heard it happen. So that confirms a bad board in mine, and the reason I'm limited to 24A.
Just an FYI for anyone who would want to check theirs. I did find replacements on DigiKey, but I wouldn't recommend just swapping them like on the Gen2 chargers. If they are blown, it's probably for a reason.
https://www.digikey.com/en/products/detail/littelfuse-inc/0HEV040-ZXBD/5233893