I was out on my mountain bike a few of years ago and a stick got caught in my rear derailleur stuffing it into the spokes pulling the chain with it. Rear derailleur destroyed, hanger bent, and 3 spokes broken. Once I replaced the spokes, I noticed that several others were badly gouged right near where they went into the hub. Since I had things apart, I headed back to the bike shop and bought new replacements. I ended up replacing 10 spokes in all, and trued the wheel. To be fair, these spokes were badly chewed up. After 4 or 5 years of riding I have not had any more trouble. In your place, I would replace those spokes