Gemara Brochos Shema Tefillah - http://kollelbokerbeachwood.com
Six things that Chizkiyah did - Brochos Daf 10b - Lines 12 - 20
http://kollelbokerbeachwood.com/articles/161/1/Six-things-that-Chizkiyah-did---Brochos-Daf-10b---Lines-12---20/Page1.html
Avrohom Adler

 
By Avrohom Adler
Published on 03/30/2008
 
Three that the Chachamim agreed to....
  1. Hid the book of remedies
  2. Ground up the copper serpent
  3. Dragged his father's bones on a bed of ropes
Three that the Chachamim did not agree to....
  1. Stopped up the waters of Gichon
  2. Cut off the doors of the Beis Hamikdosh and sent them to the King of Assyria
  3. Intercalated the month of Nissan during the month of Nissan

Three and Three