I've also never had any type of problem after redlining the engine in my truck. I don't see how one run up to or above redline could "warp" only 2 valves, besides what is a "warped" valve??? Did you bend the valve stem? Most engines can rev higher than the redline without damage to major components but engineers put a redline where the engine will not get damaged and for longevity issues. Typically the valves experience "valve float" due to the springs not being able to close them fast enough and maybe some other minor issues. And if you did experience valve float to the point where they got damaged, what about the pistons?? The pistons are the only thing that'd hit the valves so shouldn't you also need new pistons?? I'm not buying this story but if you are, someone's feeding you a real good one to get $1,500 out of you.
Also, what is that about the brakes?? You were going 70mph and jumped on the brakes?? This is how you break-in new brakes? No wonder someone's sticking it to you for $1,500 for warped valves.