The story of final fate of the LST 887 can be found in the volumes of "Jane's Fighting Ships".
From Jane's 1962-1963:
Page127, Landing Ships-Indonesia
From Jane's 1966-1967, 1969-1970, 1970-1971, 1975-1976
From Jane's 1978-1979
Around 1994, I began a long series of telephone calls with Colonel Fanz
Wung Wuwung, who at the time was the Naval Atache at the Indonesian Embassy
in Washington D.C. He was not familiar with this ship and was confused
because there is now another ship in the Indonesian Navy ( not an
LST ) which is named "Tandjung Nusanive". I had hoped to learn more
as to the final details of the end of the 887.
Since this is 20 years after the ship was deleted from the rolls, many people probably have not heard of the ship. In addition for those who don't follow the foreign news, Indonesia is a very strange place by our standards. The country is run in a completly different way than the US. One would think that someone would be keeping records of their ships, but like I said its a strange place.
In any event I haven't given up hope. I've recently made some new contacts and am making plans to learn the end of the story from different sources.