Yun Chung, a retired engineer and metallurgist, read the official report explaining why massive, high-strength steel rods on the new San Francisco-Oakland Bay Bridge broke last March and was stunned – then alarmed. At first glance, Chung said about the July report, he saw obvious errors – some typographical, others that confused basic terminology. Digging deeper, he discovered more important problems. He concluded that the analysis defied metallurgical science and common sense. “I think it’s very shameful that in this public document, this important (oversight) report, there are so many errors. (I have) a sense of outrage,” Chung said in...