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The pressure was mounting Monday on Boeing as newly-surfaced documents deepened doubts about the company’s ability to return a top-selling jet to service soon and amplified calls for a leadership shakeup.

Shares tumbled for the second day in a row after the Federal Aviation Administration on Friday sharply criticized Boeing for withholding key documents for months in probes following two crashes that killed 346 people.

The FAA rebuke added to the travails facing Boeing seven months after its top-selling jet was grounded, prompting Wall Street analysts to downgrade the company and raising speculation that it could be forced to temporarily …