A little shout out to D&R (https://www.dnrbroadcast.com/)... I'm taking a look at one of their mixers for a friend that's developed a couple of faults (well out of warranty).
Their webshop lists almost every component it uses as spares (though there's nothing too exotic to start with), and upon emailing their support team to see if there was a service manual available, I got a full set of schematics by return!
_That_ is how repairability should work...




