ETCS/PM (s/n 4) added to FRAM-1 by the STS-121 was removed on Aug.17,2010 and installed on S1 Truss, replacing a failed PM.
ETCS/PM (s/n 4) added to FRAM-1 by the STS-121 was removed by the STS-116 crew and swapped for a failed unit from P1 Truss. On Aug.17,2010 another module was installed on S1 Truss, replacing a failed PM.