Allo I'm brand new in forums. I have2012 subaru legacy with 200.000km and got timming belt redone 1 month ago car run fine until last week when timming belt slip like 90 degree and damage valve and ect.. the belt it still tight in place now the garage are telling me that they don't know why she slip so they will do nothing to help me out .new belt and tensioner were replaced you guys got any ideas why that happened thanks for your time