Quick Data Entry Job

I need small, repetative changes made to 88 pages of data:
You will receive a document with lists of data in this format:
//7AM
{7, 7, 0, 0, 4, 0},
{7, 7, 0, 0, 5, 0},
{7, 7, 0, 0, 6, 0},
{7, 7, 0, 0, 9, 0},
{7, 7, 0, 0, 10, 0},
{7, 7, 0, 0, 11, 0},
{7, 7, 0, 0, 12, 0},
//12PM
{7, 12, 0, 0, 4, 3},
{7, 12, 0, 0, 5, 6},
{7, 12, 0, 0, 6, 2},
{7, 12, 0, 0, 9, 6},
{7, 12, 0, 0, 10, 2},
{7, 12, 0, 0, 11, 1},
{7, 12, 0, 0, 12, 5},
//1PM
{7, 13, 0, 0, 4, 3},
{7, 13, 0, 0, 5, 5},
{7, 13, 0, 0, 6, 5},
{7, 13, 0, 0, 9, 4},
{7, 13, 0, 0, 10, 2},
{7, 13, 0, 0, 11, 1},
{7, 13, 0, 0, 12, 7},

You must change every line in {}, from x,x,x,x,x,x to 0,0,x,x,x,x,x,x
e.g.
{7, 7, 0, 0, 11, 0}, changes to {0,0,7, 7, 0, 0, 11, 0},

Must be done by tomorrow 20th January.