Similar experience here. First I've been in there, only factory and perhaps -- perhaps -- dealer's fella went first. First bolt I touched, I could feel the wrench failing to seat. Looked close, only minor mushing, so I rapped it with something hard and heavy. But that bolt, and indeed, the rest of them, felt real sticky.
I'm getting some new bolts, and I'm putting anti-seize on'em, as I always do on dissimilar metals. This was scary for sure.