Last night someone failed to see my horn sitting beside me, and tried to take a seat on top of it. In the process, she bent the third valve slide, and now the second and third valves have ceased working. I'm hoping this won't be incredibly difficult to fix, as I have a gig coming up next weekend, and I'd rather not have to use my other horn. Can anyone describe the "procedure" the repairman will have to do to my baby? Thanks.