SAN FRANCISCO (AP) — A California utility under fire for a deadly pipeline explosion is revealing that key information it gave federal investigators about past problems on its ruptured gas line is being called into question by some employees.

   Pacific Gas & Electric Co. quietly released a document in May showing that the same transmission line had previously sprung a leak a few miles away. That disclosure came more than eight months after the explosion killed eight people in a San Francisco suburb.

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   But the company revealed this week that its own workers’ accounts challenge the accuracy of that document given to the National Transportation Safety Board.

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   The conflicting accounts about the 1988 leak are the latest in a string of concerns about the company’s record-keeping in the wake of the September blast.

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