CNN - The FBI faces a $56.7 million funding gap as it builds a new computer system to replace a problem-riddled database of investigation files, Justice Department auditors said Monday. With careful oversight, the Sentinel program still could be successful, auditors from the department's inspector general's office concluded. Even so, the Bush administration's funding request for this year's share of the $425 million system, set for completion in 2009, falls short of what the bureau said it needs keep it on track. The FBI asked for an estimated $150 million in the fiscal year that began October 1; the White House approved spending $100 million. Congress is not expected to approve the FBI's funding until next year. A 112-page audit of the Sentinel system's progress "found that the FBI faces uncertainty" over how to meet the funding needs to continue building it.