The Steamship Authority has replaced two damaged transformer blocks at its Vineyard Haven terminal. Eversource crews began mounting new 4,000-volt transformers atop the blocks last Thursday morning. The blocks are SSA property, while the transformers are Eversource property. Each block was cracked and crumbling. with one block held together with chains. The SSA blamed their condition on one or more truck strikes, while Tisbury building inspector Ken Barwick said wave action from a storm caused the damage. The terminal was run on a rental generator throughout the week while the work was underway. SSA spokesman Sean Driscoll said normal power was restored between Thursday and Friday of last week.