Hi all, I need to replace the internal battery for both my SY77s, I have ordered the replacement batteries from US, anyone can recommend any service center who can desolder the old batteries from the circuit board and solder on the new ones? Or anyone with soldering experience who can help for a fee? The batteries should be arriving in 2 weeks. I can remove and just bring the circuit board with the battery down. I have no soldering experience. I contacted Yamaha and they said they don't service the SY77 anymore, tsk. Thanks.