Annuli B and C failed leak off test. Oil producer. Objective of the job involved detection of corroded zones with a subsequent determination of the water path during injection. During the run in hole, real-time corrosion logging tool (EMDS) detected the zones with highly corroded intervals, that helped narrow the search of leak points with spectral noise tool. The objective was achieved with EDSN combo tool , the combination of corrosion and spectral noise modules using surface-readout technology.