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Mesa d800 and passive basses causing distortion/overdrive

Hi.
I have the same issue with my D-800+.
The amp worked great until a gig last night. The sound is unpleasantly distorted now, no matter where I set the controls. Checked my set-up with a GK MB 500 and the bass sounded fine.
Is this something a local amp tech could fix or do I have to send the amp to Mesa?
Thank you.
Message me and I will get you the non-warranty service program info.
 
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