After six days of deliberations, the jury in the high-stakes insider-trading trial against hedge-fund billionaire Raj Rajaratnam was told to go back to the drawing board after the 12-person panel was forced to call in a new member.

Juror No. 2, a 70-year-old retired bookkeeper, was dismissed yesterday for medical reasons. She was replaced with a 39-year-old foreman for the Westchester County Parks Department.

“The law requires that the jurors begin their deliberations anew,” Manhattan federal court judge Richard Holwell told the new jury around 10 a.m. yesterday.

Rajaratnam, who faces 14 counts of conspiracy and securities fraud, wasn’t present for the switch. After being a daily presence since the trial started in March, the Galleon Group founder has been absent since Monday due to foot surgery last weekend.