I began by inspecting the LiftMaster chain drive to identify any issues with the sensors. I carefully examined the alignment and positioning of the sensors, ensuring they were correctly mounted and unobstructed. Next, I calibrated the sensors to ensure they were working in harmony with the garage door system. This involved fine-tuning the sensitivity and response time to guarantee smooth operation. I tested the sensors multiple times to confirm they were detecting the obstruction correctly and triggering the door to reverse as intended. After adjustments, I conducted a thorough test of the entire system to ensure the sensors were functioning optimally. The garage door now operates seamlessly, providing reliable and safe performance.