This is what I have been told about XV227 and the change in procedures following XV230.
"..we had an aircraft scrapped a year ago due to hot air leak
damaging the rear spar, the fuel tank possibly responsible for the ultimate
explosion on XV230 was significantly damaged and could have exploded due to residual fuel boiling. They made a bit of a mess of the whole inspection
procedure and it took some weeks to establish the extent of the damage. We now drain these tanks(7's) before flight and leave them empty, work is
underway to blank them off but the vent system uses the tank."