The Social Security Administration released an audit of the agency’s customer service on Monday, confirming previous statements that the agency has made significant improvements.

The report comes after Social Security Commissioner Frank Bisignano briefed Sen. Elizabeth Warren (D-MA) in July on various improvements the agency has made, prompting skepticism from the senator. Both Warren and Bisignano agreed to an independent review of the SSA’s performance, which the agency’s Office of Inspector General has completed.