it wont matter how old the dx-7 is it would still be in warranty. they havent been out 3 years. i have been flying jr for as long as they have been on the market and never had this problem. not saying that it couldnt happen. just saying never herd of it. i'am sorry for the loss. but as others say,and as i do allways,allways, preflight. so its really hard for you to expect horizon to pay for your negligence to do your duty as the pilot,to do a preflight check. sorry but you just have to bite the bullit on this, and let it burn in the ole memory file (the brain). they will indeed be as good as da and fix the problem,if they find one for free. of this i'am shure. they are awsome to deal with. and that is why i buy as much as i can from them. i trust them they have allways done the right thing for me for the last allmost 20 years
