In the picture on the left, you can see ponding water, which has, in part caused a roof leak. The Built Up Roof is old and the felt is exposed now that the tar has worn off and has bubbled up and deteriorated. The section where the ponding is visible is attributable to removal or a bearing wall, which you can see in picture 2. Removal of this wall caused minor settlement of these joists. Picture 3 shows some of the ongoing damage from water.