My spider III amp (2009) is fantastic and still gives great sound. Recent problem : CD/line in port has an intermittent connection fault - suspect failing connection behind face panel - CD line in port is on the front, directly below the guitar input 1/4 inch port. Works fine when cable held to one side. ( it's not a cable fault - same issue with other cables ). How do I get access to the joints behind the panel so I can check or re-solder ?