Rongli GengTILC09, 4/17-21, 2009, Tsukuba, Japan12 As built As found following last RF test HG7 BCP+ EP, 26.5 MV/m quench no X-ray One example of documented natural EBW defect Cell #7 EBW overlap Pass-band indicates quench source in Cell 1/7 Next step T-mapping suspected region Candidate cavity for countermeasure development