It’s been back for a couple of weeks, fixed with all imbalance gone and a rock solid centre image all the way down to zero. More usefully it sounded great as soon as it went back in as a straight swap for the temp refurb loan stand-in, which could suggest that the pot replacement also improved sq to where it should have been.
The first 3 months of ownership were a disappointment. It’s been superb ever since it came back. Make of that what you will.