My understanding is the older engines were able to burn "bunker oil" which is thick, tarry, and very, very sticky. It requires heating to be applied to the fuel in the storage tanks, just so it can be pumped through the lines to the engine.
My guess is as part of the effort to reduce the crew by approximately 900 men (from pre 1980's refit) this heating system was removed. If so, the ship(s) would no longer be able to utilise this type of fuel - the boilers could probably still burn it, but pumping it from the tanks would be impossible.
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If it moves, shoot it, if not push it, if it still doesn't move, use explosives.
Nothing happens in isolation - it's called "the butterfly effect"
Mors ante pudorem
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