Major auto parts maker First Brands Group, LLC . filed for bankruptcy protection over the weekend — revealing billions of mounting debt in the process.

The auto parts manufacturing company filed for bankruptcy Sunday, Sept. 28, after disclosing more than $10 billion in liabilities , court filings show .

Bloomberg described the filing as “capping weeks of turmoil sparked by creditor concern over the auto-supplier’s use of opaque off-balance sheet financing.”

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According to financial firm Investopedia, off-balance sheet items are important financial elements that remain unlisted on a company’s main balance sheet.

“These items, often detailed in the accompanying notes of financial statements, bec

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