Since refrigerators are hardly rocket science, I just fixed the silly thing myself.
Got up to the house for memorial day weekend to find the usual: freezer above freezing, refrigerator cooler than the freezer, and evidence of water all over the floor in front of the freezer.
So, long story short, tired of these shenanigans, I took it apart, and found massive ice accumulation on the lower evaporator coil and defroster. After cleaning all the ice out, I powered the machine back up, watched it frost and defrost the evap coils, and deduced the obvious: the evaporator fan was defective and switch on the refrigerator door was likewise defective.
Bosch parts are unobtanium at the appliance supply houses around here, so I had to order the parts from Sears Direct, paid highway robbery for expedited shipping (3rd day delivery), and went back up last weekend and put the machine back in service. My wife went up there tonight and reported to me that the freezer is frozen, the fridge is cold, and the machine seems to be working properly for the first time in a long time.
The "technicians" that previously had come out to fix the machine were clearly incompetent - all they ever did, according to my wife, was swap out the control board on top of the machine. The replacement parts were reasonably priced.
Considering the machine had a couple of parts fail early, the abysmal and useless warranty service, non existent local availability of common parts most likely to fail, and relatively high price, I probably won't touch another Bosch refrigeration product with a ten foot pole.
And I won't lose any sleep over Sears going down like the Titanic, either.