WASHINGTON — Alarmed by significant deficiencies uncovered as part of a regulatory review of mortgage servicer practices, the federal banking agencies are preparing formal enforcement actions against the largest servicing companies, hoping the actions will set de facto industry standards, according to sources familiar with the situation.

The enforcement orders are expected to hit most, and possibly all, of the 14 mortgage servicers reviewed by regulators after foreclosure problems surfaced in the press last year, but the largest companies — including Bank of America Corp., JPMorgan Chase & Co., Wells Fargo & Co. and Ally Financial Inc. — are likely to face the toughest requirements due to the sheer number of issues that must be addressed, sources said.

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