Even after the ship's decommissioning and two ongoing investigations, the public knows little about what sparked the blaze.
The new problem affected the same tank, but a Navy official familiar with the problem said the issues appear to be unrelated.
The guided-missile cruiser Vella Gulf has a fuel oil leak in one of its engineering spaces.
The fire is the fourth to break out on a Navy ship in recent months.
The agency also found poor communication between the bridge and combat information center contributed to the accident.
The Navy has recovered a $2 million anti-mine pod dropped by one of its helicopters this month off the coast of Virginia.
Damage on some decks spanned the length of the 844-foot ship and reached 106-foot-high ceilings, the CNO said.
Chief of Naval Operations Adm. Mike Gilday said the Navy is launching three investigations into the ship's fire.
Firefighters have extinguished blazes on the Navy amphibious assault ship Bonhomme Richard after four-plus days of efforts.
Forty sailors and 23 civilians have been hurt battling the blaze on the amphibious assault ship Bonhomme Richard.
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