Changing a preset A1 changes 2 bytes at byte 263, which I'm guessing are a CRC on either a bank or a station. The station name starts at byte 269 and runs to byte 276. I'll guess bytes 277-279 are the station but I can't prove that yet.
Two bytes at byte 283, and 2 at byte 477 also seem to be changing, sometimes, and I haven't figured out what they are. I think I will sleep and try to find some time tomorrow.