[AH] My 808 is buzzing... repair advice requested

From Kenny Balys
Sent Thu, Feb 1st 2018, 00:15

My 808 has started humming a little bit. Really noticable on stage with 
a club soundsystem.

I have not ever repaired an 808 before so any advice is appreciated.

The symptom may be 50Hz mains bleed or a frequency that is close.

What do I need to replace here?

Thanks in advance for any information.