Upon customer report of sewer odor emanating from the kitchen sink area, a thorough inspection was performed beneath the sink. Identified an abandoned and uncapped drain line contributing to the release of sewer gases into the living space. The abandoned branch line was properly cut back and capped using a 1 1/2 inch furnco cap to prevent future gas infiltration. Verified the integrity of all existing drainage and vent connections. Performed a functional flow and leak test on the kitchen sink drain and trap assembly—no leaks detected, all components functioning properly. Resolution: Sewer odor eliminated at point of entry. System now sealed and operating within code compliance.