In July an internal audit revealed a paperwork problem with Shaw subcontractors.

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When Amerco wanted to disclose to investors PwC's role in the accounting problem, PwC threatened to yank its audit opinion on Amerco's SEC filings, which would have had crippled the company financially, the suit says.

FORBES: Magazine Article

Deloitte said no problem, even though target and acquirer are potentially both audit clients of Deloitte.

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Imagine if the problem had been first identified in November via a process to audit related systems based on the one reported intrusion into the internal chat application, or if an intrusion detection system had started firing red based on the exfiltration of their entire MySQL database.

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The problem, they said, was that the company's internal controls were weak, and the audit trail was not strong enough.

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Chair of the audit committee, Plaid Cymru's Janet Davies, said there was no simple solution to the problem of staff shortages.

BBC: NHS staff shortage is 'unclear'