A man died today while he was making repairs to his roll off tractor-trailer on Mo'oiki Street at Waikupanaha Street in Waimanalo at 1 p.m. The man was pinned under the bin of the truck when it came down on top of him, said Honolulu Fire Department Capt. James Todd. Firefighters used the jaws of life to extract the man, Todd said. No other details were available.