Great amp, crashed and burned after 30 hours... Buyer protection?

Thank you.... my buddy was screwed because the 30 hour point was after 63 days.... no recourse with anybody, seller said it worked for him and worked for my buddy, so tough luck.... repair shop told my buddy that the repair done on the amp previously was lucky that it even lasted that long... real hack job, counterfeit parts... I will definitely double check anything I buy, and do what you have all suggested... seller basically told my buddy to get lost... 

Sorry, Just take the cover off. If my buddy had taken off the cover when he first bought the amp, he would have seen the some of the work and known right away it had been tampered with... your nervous?! Imagine me with the horror story to go further in the hobby!!
I think at the end of the day, my buddy was really choked with the sellers attitude.... because up to than he was very happy with every deal, on all the websites... one rotten apple in the barrel I suppose.. what we call the "A-hole" factor in my businesses... (will that be edited out?)