what are my options on fixing the braze on below?
A welder is my initial thought, but until then, anything (JB WELD or such) to patch it?
I road it hard yesterday with no issues, but not sure what the future holds.
Another angle:
Guru can probably fix it. Looks like it’s using 2 rivnuts to hold it on.
Bigger issue, why did it break?
As always, use a torque wrench.
frame was bought used…my wrench noticed it when switching parts to the bike.
Based on experience (07’ frame) on a scale of 1-10 as 10 being VERY BAD…what is the urgency here to fix.
The wrench said it could hold for the life of the frame.
I understand guru can fix…but, was not wanting to part with my bike for x days.
tks…Kestrel Man 
Could hold or could go anytime. You are going to part with the bike when it goes, so why not pick when. I bet they will be quicker than you fear. Ring them and find out.
bump…looking to someone who has repaired one.
My suggestion is that you get it fixed. Your shop “may” be able to do this but not sure how skilled they are. I would contact Guru to see if they have the part and then have them discuss the repair with your shop.
I have fixed one of these. JB Weld would not work for mine, but mine was seperating or spliting when your tighted the bolt. I would try the JB Weld if yours is not seperating. I had a someone weld it in the end and it works fine. Looks like hell but works great.
The repair is a pretty easy one to take one but requires a pretty skilled TIG welder and someone very handy with a Dremel. First thing you’d need to do it lightly Dremel off the current coating (since it appears to have a slightly black sheen on it) all around the crack…as clean as you can make it (the welder will need it this way for a good weld). You will also want to make a small trough on both sides of the weld so the metal going into the weld has some purchase on it. I can find out exactly which Dremel bits you will need later if you want (heaven knows I have them all). Here is where the skilled welder comes in…and by this I mean someone who does TIG welding for a living. Since this hanger is hanging on a carbon frame they will have to be extra careful to not damage the carbon. Pretty sure yours is an aluminum hanger but someone should check with Guru to be totally sure otherwise you’ll wreck it completely and then have to hope Guru can put a new one on for you. The finished product will look pretty ugly and be quite excessive. Taking another Dremel bit slowly hone down the excess weld until you get back to your desired shape. Doesn’t sound easy but it really isn’t difficult in the right hands. The welder might also want to take cold damp cloth and put it on either side of the hanger to prevent heat transfer.
For the record I have repaired at least three frames using this method and you would be pretty hard pressed to tell on any of them that something was wrong to begin with.
EDIT: IF you do not removed the front derailleur from its current position…ever…it should hold for a long time. The added stress of being in the big ring most of the time might speed the cracking process though.