Delphi CEO Alan Dawes resigned in March after an accounting investigation.
According to a statement from Delphi's independent audit committee filed with the Securities and Exchange Commission, its internal investigation "continues to review the conduct of certain lower and mid-level executives." But it believes that no more changes will be necessary among its "top management."
The company is preparing to present those findings to SEC investigators who are examining Delphi's bookkeeping practices, said Delphi spokeswoman Claudia Baucus.
Meanwhile, the U.S. Justice Department has begun its own investigation of the company, and the U.S. Postal Inspector also is investigating some aspect of the scandal.
Officials with the Detroit offices of the FBI and the U.S. Postal Inspector declined to comment on the case or explain why the two agencies were involved in the case separately.
The Postal Service conducts its own investigations when criminal misuse of the mail is suspected, said Detroit Postal Inspector Fred Van de Putte.
FBI spokeswoman Dawn Clenney said the FBI is coordinating its investigation with the Postal Inspector, as well as with SEC investigators, who have been looking at Delphi since last year.
In March, the Troy, Mich., company revealed that it had accepted the resignations of CFO Alan Dawes and chief accountant Paul Free.
The departures came after seven months of re-examination by Delphi's independent audit committee of bookkeeping practices stretching back to Delphi's 1999 spinoff from General Motors.
According to SEC documents, Delphi incorrectly accounted for millions of dollars in rebates paid by suppliers in exchange for Delphi contracts, as well as a $237 million payment Delphi made to GM as part of its spinoff settlement.
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