Emptying the hurt locker at IM Zürich

I'm not going to nag about my bike getting lost, my bike box getting destroyed or my bike computer and my wheels getting FUBAR. I WILL nag about the back pains though. After doing the first 80 kilometers of the bike leg at an average of about 42 and never going over a 149-151 pulse, the pains started and never went away. The hurt completely cut of my legs during the rest of the day. It became so unbearable that I was ready to give up during the second climb of Heartbreak Hill at only 5 k's from the bike finish. Instead, I stopped, got of the bike, massaged my back for 4-5 minutes and continued. I repeated that procedure at every aid station during the run, finally posting 10:21. Mixed emotions. But I'm sure of this: if we solve the lower back pain problem, I will go at least 45 minutes faster on the same output.