I know its a transatlantic call, but have you phoned Meridian UK? You would probably get to speak to discuss the matter with the guy actually responsible for designing, building and calibrating your product rather than get it 2nd or 3rd hand through your dealer or Meridian US.

You experience may also assist Meridian in sorting out your problem quicker.

Meridian owner since 1992
Prime & PSU, Focal Elear headphones, Roon (ROCK 8Gi5 NUC), Explorer 1 & 2, F80. 200/203, various Sonos (via Roon).