Kitchens in buildings, not houses
A pre-war apartment kitchen that has been renovated to hold integrated refrigeration is a tight, tall room. The column is flanked by cabinetry that runs to a high ceiling, the grille breathes into a soffit, and there is often no realistic way to pull the case forward without emptying the room first.
So the diagnosis is done in place wherever it can be. Temperatures at both compartments, current at the compressor, defrost cycle observed — all of that happens without moving anything. The unit only comes out when a reading says the fault is behind it, and by then we know what we are going in for.