The original repair was a stuck valve - from your original post. I have had several of these repairs performed. The heads have worked fine afterward and to my knowledge don't require changing seals. This repair would have not affected any of the seals on a print head. So you got it back and used it for several prints. Then the o-ring failed. So what is the issue with how you were treated? You paid for them to repair the valve issue. The valve issue would not have affected the seals. So you got what you paid for. Again, there is no indication that the second failure would have occurred in time. I am still trying to understand why you feel you were treated so poorly.