Calf tear - 6 weeks out from 70:3

Hi all, had a calf tear 4 weeks ago. I'd been training for 8 weeks and was feeling fit and strong then "bam".
I fully rested it for 3 weeks and went back to gentle jogging this week. I did 1/2 hr Mon, then an hour on treadmill Wed, today 3 kms into my run "bam" calf again!!!
My question is what do I do? I have the swim and cycle leg sorted but the run is my weakest leg. Do I stay off it till race day? Do I get someone else to do my run leg (change to team entry) or do I stay off it 'x' number of weeks and try to get some km in the legs in the 2-3 week lead up?
I'm stuck??? Anyone else had this happen and can share their knowledge/experience or give me advice?
Cheers, Tracy