Not just truing, re-tensioning. They need to relax ALL the tension on ALL the spokes, bring it back up to tension while destressing the spokes along the way. If they dont regularly build wheels from parts or some fucking high school kid says he'll fix it then take it elsewhere. alternatively, if the guy has a long beard and looks like a bike wizard you're in the right place.
What is happening is that while the wheel may be true, the spoke tension is not even all the way around, so when you ride it the spokes get too loose and will break.
What is happening is that while the wheel may be true, the spoke tension is not even all the way around, so when you ride it the spokes get too loose and will break.