Hello filip_kbh,
Thank you for your posting! I am having the same FM offset issue with my BM7000 after the backup battery change. I plan to follow the instructions you outlined.
Also, where can I find a Beomaster 7000 service manual PDF file? I have searched all of the usual web sources but can only find a schematic drawing. I do have a Beomaster 6500 and a copy of its service manual but the tuner board appears to be different.
I appreciate any advice that you can pass along.