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Abstract High-resolution acoustic imaging was deployed in a Gulf of America (GOA) well to locate a lost wireline tool and inspect malfunctioning Gas Lift Mandrel (GLM) valves. This inspection included the deployment of an advanced multi-axis degree of freedom high-resolution acoustic imaging technology for the purpose of investigating, in real-time, a fish top and malfunctioning GLM's. This paper introduces the technology and walks through how the operator deployed it multiple times to inform the fishing operations strategy, monitor its progress, as well as confirm the GLM valves functionality following the coiled tubing fishing operations. This technology was critical in providing information that enabled the removal of the wireline tools, avoid a workover, and ultimately return the well to production in an efficient, reliable and cost-effective manner. During a routine GLM valve change out operation, the wireline string became stuck. Initial fishing attempts to retrieve the string using wireline were unsuccessful. Following this unsuccessful operation, the operator mobilized the high-resolution acoustic imaging technology to visualize the fish, determine a fishing strategy, and inspect the uphole GLM's. This acoustic imaging technology utilizes a high-density array of up to 512 independent sensors that encompass the imaging probe's head. The multi-degree of freedom imaging head of the acoustic imaging tool is precisely positioned with an accuracy of +/-0.005-in to inspect the fish-top in real-time. Each sensor captures amplitude, or acoustic, intensity signals and time of flight measurements which are then processed into 3D renderings with submillimetric measurements of all key features. The sensor's array is controlled entirely electronically via software to focus the acoustic energy at the casing and fish. The high-resolution acoustic imaging probes precise positional accuracy and submillimetric resolution enabled the operator to successfully inspect the GLMs and fish top. This investigation determined that one of the GLM's valves above the fish top was missing and located the wireline stroker's fishing neck in a lower gas lift mandrel. Armed with this information and images of the GLM and fish, the operator successfully retrieved all fish in the well, repaired the GLM, and returned the well to production. This successful operation saved several months of lost production and more than tens of millions in additional completion costs by not having to pull the tubing and re-run a new tubing completion. Traditional devices used in these applications, such as cameras and lead impression blocks, are unable to image and inspect in non-clear fluids and lack the resolution required to identify the fish and its orientation.