Unfortunately, I think my Mjolnir is going to need to go back to Schiit for repair due to two switches: the gain switch and SE/PP switch.
The gain switch doesn't always toggle the left channel, so I have to push the switch over and away from the volume knob to get the left channel to fully kick into high gain. If I wiggle the gain switch when in the "up" position, the left channel's gain goes up and down and I can hear a relay clicking on the inside.
The PP switch also causes a relay to click on the inside if wiggled when in the up position, although because the effect is so subtle, it's difficult to hear whether the left channel is being similarly affected--but I assume so.
The feedback switch seems to work just fine.