Couple of options. Pay a premium and buy your sax from a dealer, with a warranty, so you have peace of mind. Or, buy it privately, and get it sorted by a reputable repair person. YAS62s are well built and designed for pro use, and are tough.
If you think this is a hassle, then buy a new TJ. I wouldn't, as I think the YAS62 is a great sax, and in good order will be all the alto you'll ever need. There is nothing wrog with the TJ SR, they own their own factories in Taiwan, ad do a final checkover in the UK, which all helps them control quality throughout the supply chain. I just don't think it's anything like as good as the YAS62.