Penguin is correct, there was no "restoration" as such done just after the war. The museum didn't physically acquire the boat until 1954; the full restoration was only begun in 1997 when they decided to move it indoors.
From 1944 through 1954 the boat was in the hands of the US Navy. They sent her around the country on a war bonds tour after VE Day and certainly she was thoroughly examined for whatever intelligence and technological insights she might yield, but they wouldn't have been doing anything to restore or preserve her. Just the opposite, they were planning to get her "off the books" by using her for target practice until the buyers in Chicago intervened and saved her from destruction.
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