Yes, you need a lead revision. Along with the revision will come a new battery (Pulse Generator) most likely.
Good News is, the new system, with new technology; will probably last the rest of your life.
The likely source of your issue is a break in the insulation of the lead. Unlikely though it may be, leaving it in could theoretically result in a larger break in the lead and could even be serious to the extent shere you have a sharp broken metal wire bouncing around inside your heart. Noone wants to risk that.