I've had a Line Magnetic 518IA 845 SET , which is now called 845IA, for 5 years no operating issues whatsoever. If you haven't already, you might reach out to US importer Jonathan Halpern - Tone Imports to ask if there is US based tech support ; I don't recall if there is. His email is
shindo.usa@mac.com
shindo.usa@mac.com