Apparently they interviewed Rex Ward on the cause and problem that caused the sinking , on local radio today.
He said same, tyre round prop, ripping out the bearing holder (carrier) causing prop to flap about like dick in a bucket (yes, thats a technical term...!!!) damaging hull and causing water ingress!!
They are highly modified close up, not much original left after all the military has been removed and civilian / safety has been put in its place.
The ones in singapore look just like the military left them apart from the roofs, hoods, covers etc, even still got the bullet holes in them!!!!