From the new information given at today's PC is seems that the last "All right" transmission may or may not have happened after ACARS was switched off/failed:
Last ACARS: 1:07am
Next expected ACARS: 1:37am - this did not happen so switched off/failed somewhere in between
"All right" message: 1:19am so this could be either before OR after ACARS was switched off/failed. When probed by a journo the Minister did not want to go into it which is strange to say the least - is there some other info not being shared with us on this as to my knowledge they were saying that it was switched off before the "All right" message.