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Bosch 880 Security Syetem

Hi There, I have a Bosch 880 security system. I have a Bosch 880 security system. It seems to have lost power to the unit. I replaced the battery, and it ran for 4 days, so I assumed it isn’t receiving power to the unit. I had a technician in today that told me exactly what I told them, so was a waste of time. I would like to get this system up and running for the new owner. The remote sensor in the garage has new batteries too. I believe if power can be restored to the unit, the faults will be able to register at the keypad, and get it working again. If you have knowledge of these, please let me know, I am available to chat it through. Thank you