I hope this thread doesn't make people doubt their 75s or future 75 purchases. I've been riding mine for 3 years with a few rebuilds and the threads are like new.

The force needed to strip the threads all the way from the bottom would seem to me quite great. Crank threads and BB shell threads are one of those areas of bicycle repair I am quite careful with... especially since I only learn from mistakes

Good luck OP, I suggest you don't waist your time with a warranty. The cranks are still usable, just takes longer to rebuild the BB.