Restore the core operational control of your 2-Group La Marzocco Linea Classic S AV (Automatic Volumetric) espresso machine with the genuine **LINEA CLASSIC S - Button Panel 2GR AV (C.1.578.2)**. This essential replacement interface features a durable, high-quality membrane panel designed to withstand the rigorous demands of a commercial environment. Specifically engineered for the 2-Group volumetric model, the panel includes the necessary pre-set dose buttons for seamless, repeatable espresso shot programming, along with the manual continuous-flow button. Ensuring precise electrical continuity, this OEM button panel maintains the machine's factory-specified volumetric accuracy and tactile feedback. If you are experiencing issues like **"Linea Classic S buttons not responding"** or **"2-group volumetric panel error,"** replacing the button panel assembly is the definitive solution. The C.1.578.2 panel resolves problems of intermittent dose activation and worn-out button membranes, ensuring every barista can consistently execute pre-programmed volumetric shots, minimizing training time and maximizing efficiency. The panel's quick-swap design minimizes downtime, offering a cost-effective way to fix **"broken La Marzocco dose buttons"** and guarantee standardized extraction across all groups, which is critical for consistent espresso quality. Installation of the LINEA CLASSIC S Button Panel 2GR AV restores your machine's ability to utilize La Marzocco's reliable volumetric technology, which measures the precise amount of water delivered for each shot. This makes it ideal for busy cafes looking for **"how to fix volumetric dosing on La Marzocco."** Ensure you are purchasing the correct part for your specific 2-group AV model to maintain compatibility and performance. Invest in this authentic OEM replacement from Kaldi.com to safeguard your machine's electronics and ensure years of reliable, hands-free volumetric espresso dispensing.