Radar tapes perhaps...
Yes there may well be some data that was automatically captured and stored. As with MH370, will be less than 100% transparency regarding this - no one wants to reveal their capability (or lack of capability).
That's assuming it was within range of primary radar anyway. Its last known position was a fair way off shore, and even further away from any major centres.
What is the primary coverage like in the Java sea between Jakarta and Borneo?It may not be that great