Resolution calls on USPS to preserve current schedule as agency faces growing financial crisis.
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But committee members differ on exactly where to begin responding to detailed report from GAO.
House, Senate reach agreement on two-week reprieve.
Obama budget would give agency a 5 percent funding hike to $11.8 billion.
Two-week continuing resolution keeps government funded through March 18.
Seven-member panel of experts would examine status of 14,000 vacant facilities and 55,000 underutilized buildings.
Vice President Biden will assume the role of lead Democratic negotiator.
Jay Carney said the White House would accept up to $8 billion in cuts in a spending bill to keep the government running for a month.
Employees march against furloughs, other cuts as agency offers early retirement.
Cash-strapped agency says it needs immediate relief to avoid defaulting on advance payments to its retiree health fund.