Historical clue formulations

• Get back to business? — 2017-11-17
• Investigate, as a cold case — 2015-10-04
• Come back following renovations, say — 2009-09-02
• Tap anew — 2005-03-25
• Come back to, as a case — 2001-10-03
• Start over — 1999-10-02
• Crack again — 1999-07-21
• Go back into business — 1999-07-13
• Look into again, as a case — 1997-11-30
• Go back into business — 1997-03-26
• End a shutdown — 1997-02-06
• Begin again, as a debate — 1996-11-26
• Unlock again — 1995-09-20