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MXR M81 - Needs Repair

Hi,

I have a MXR M81 Bass Preamp.
I played it last time a week ago and it worked fine.
But last night, when i plugged it in, the pedal was muted. tried the same setup with my MXR M87, it works fine. Seems like the M81 is having issue.

Is it repairable?

Please see attached video for details.