This afternoon Dollywood posted an announcement on their website:
From the statement, it appears to indicate all roller coasters made by RMC are ordered closed until further noticed due to a mechanical part needing to be replaced.
However, this is a statement from Dollywood and not from Rocky Mountain Construction so we can't assume this includes roller coasters build at other parks or just one build at Dollywood itself.
We will update this thread as we get more information!
Update #1
Kentucky Kingdom confirms that RMC's president, the closure does NOT include Storm Chaser