Replace. I'm going to catch some flak for what I'm about to say, but here it goes: get a really nice aluminum bar. Lots of options, even on the used market. Reasonable prices, lots of designs. Many are actually very light, and light enough for 98% of all rider's needs. And although I'm sure that aluminum bars fail, I haven't seen or heard of it happening, personally. Carbon, on the other hand, has it's risks. I know of one instance where a bar snapped while the rider was well into a fast corner.