I couldn't find any information about an ACS – Automotive Calibration Specialists located in Rancho Cucamonga, CA. However, there is a company named Automotive Calibration Specialists (ACS) with multiple locations in California, including Watsonville, Roseville, Chico, and Carson City, NV. They specialize in Advanced Driver Assistance Systems (ADAS) calibration, diagnostics, and post-collision mechanical repairs.