Following the GeV flare detected by Agile and Fermi on 2010-09-19 (ATELS #2855 and #2861), a series of three Chandra ToO observations have been carried out on 2010-09-28 (ATel #2882), 2010-10-28 (ATel #2994). The last observation of this series was performed on 2010-11-28 between 10:57:53 and 12:58:59 (UT). The sequence of the three images reveals a successive brightening of the NW part of the X-ray ring during the last two months by about 15%.