MH370

I am sure that many of you know that flight MH370 disappeared on March 7, 2014 (UT) and has never been found. There are many groups still trying to understand the disappearance and as we work through the complexities of everything from satellite communications to details of the plane electrical system, questions continue to arise. We know that the ATS-B data that has been reported stops at about 17:01UT. However at a later date we determined that the aircraft electrical power was removed from some systems shortly thereafter and restored at 18:25UT. But the ATS-B transmissions not appear to resume. However, there is some question about the availability of such data due to coverage limitations.
We are particularly interested in learning more about the ensemble of data collected by Banda Aceh, in particular, during the period 18:25UT to about 19:00UT.
I tried to access the historical data on this site, but was unsuccessful, perhaps due to my lack of experience.
Can anyone help me moving forward?
Thanks,
Sid