Welcome to the forum.
You could get in touch with Lexicon and ask them about their repair suggestions. They probably have a flat rate. Contact info:
Lexicon • 1718 W. Mishawaka Rd., Elkhart, IN 46517 • tel: 516.594.0300
Same for Sansui. Try here:
http://www.sansui-global.com/english/contactus.php