Hello, I bought this week a Marshall SC20CNB. Searching some forums, I noticed that there is a problem with Effects Loop in some SC20 units (all of them models? combo or head?), and that you have a solution to fix the problem.

I'm waiting for my amp to arrive next week, but already anticipating, does this limited series (Navy Blue) has this problem? Could you tell me just by the serial number?

As I live in Brazil, I’m worried if you have some authorized technical assistance here.

Kindest regards.