Inspectors have found at least 60 faulty bolt fixtures that supported the ceiling of the Interstate 90 connector tunnel in the same section where concrete ceiling panels fell and crushed Milena Del Valle, state officials said yesterday. Though the tunnel passed at least one previous safety inspection, the faulty bolt fixtures -- which Turnpike Authority officials yesterday called ``suspect" and ``compromised" -- went unnoticed until the 38-year-old's death Monday night spurred an unprecedented criminal investigation of the Big Dig's safety. State officials were uncertain whether the faulty bolt fixtures found in the approximately 50 ceiling panels along 200 feet of...