DC offset in Marantz SR7013

Hi,

My Marantz SR7013 have begun to shut off with a bang due to DC current offset.

To troubleshoot I have disconnected everything and measured all the different speaker terminals with a multimeter on 200mv.

I measure around 0,02 – 5,1 mv, and everything seems fairly steady until it shuts off and the meter goes wild for a second.

I have tried this before in September and after shutting off and shutting off it worked again for now 2 months.

Do anyone have any ideas on what could be causing this?

Br,

Zillo