I am having a problem with power supply board. So far it is causing the amp to re-set (power off, power on) randomly. I have diagnosed it by duplicating the issue with tapping (or lighly pushing) on components on the power supply board. Reading the forums makes it seem like it is (somewhat) a common problem with these amps. 

How can I get a power supply replacement board so that I can enjoy using this (otherwise) great amp?

Thanks