Sorry I cannot. As I understand it AOR no longer support the 3000 anymore, and the U.K. Main Dealers seem to want to send Radios back to Japan rather than repairing them, but AOR are likely to refuse that. Out of interest, when you perform the full reset are all the Memories wiped? If not, perhaps you are not following all that Reset requires as described in the Video.
I assume you carefully examined the PCB around the backup battery, for 'leakage' damage. My last resort would be to assume the replacement battery is at fault, or its connection to the main PCB. I do know that if the battery is not working correctly I had the same sort of errors you describe, and after fitting a good one it was very important to follow all the Reset steps exactly.
After fitting the battery I would also use a Meter to check the surrounding connecting strips to make sure the voltage is reaching the nearest connected components as it should.
Good luck.