At this time FLRA remains fully operational.  Effective Friday March 20, 2020 until April 30, 2020 the agency will no longer receive in-person filings.  

See details: here.

FLRA.gov

U.S. Federal Labor Relations Authority

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Department of Homeland Security, Bureau of Customs and Border Protection, Houlton Port of Entry, Houlton, Maine and Chapter 141, National Treasury Employees Union