My Arçelik Coffee Maker’s Right Unit Still Fails to Brew Enough After Service Visits

Despite sending the device to service multiple times, there is still a significant difference in water levels between the right and left coffee brewing units. Despite repeatedly venting the device, cleaning it, and performing the necessary maintenance, the water levels have unfortunately not equalized. When I take it to the service center, they claim the water levels are normal, but previously, I could brew the same amount of coffee in both units. Now, while the left unit produces sufficient coffee, the right unit unfortunately does not. I am using the coffee maker on setting three. I am seeking your assistance, as this situation is seriously frustrating. I have already paid around ₺5,000-6,000 to the service center for this device.