Duff batteries will often blow this resistor on the Optima/Accenta panels and I'd say it's not economical to repair due to other components that may have also been damaged.
The Accenta is a reliable domestic panel if it's looked after so to keep things simple, I'd recommend you stick to the G4. The terminal descriptions are common to both models so it would be an easy swap. You can simply replace the PCB and the mains transformer, re-program and test and bob's your dad's brother. The programming isn't the easiest to follow but it's not impossible. Just remember to change your battery every 3 years and you shouldn't get any more problems
The Accenta is a reliable domestic panel if it's looked after so to keep things simple, I'd recommend you stick to the G4. The terminal descriptions are common to both models so it would be an easy swap. You can simply replace the PCB and the mains transformer, re-program and test and bob's your dad's brother. The programming isn't the easiest to follow but it's not impossible. Just remember to change your battery every 3 years and you shouldn't get any more problems