Thermador KBUDT4270A02 SxS not maintaining temps

[Fritz]

Therma service replaced the evap motor as the freezer was icing. He felt the seals/gasket were OK, though certainly not perfect.
He also replaced the water filter housing.
The evap motor replacement cured the ice up, but now it is not maintaining temp at all.
44 & 22 respectively.
It did manage to make at least one batch of ice and drop to 35º/0º after about 6 hrs, which seemed normal to me.
The fan in the compressor compartment is running at about 80º.

Any thought on what might be the issue?

He pointed to a tiny part on the evaporator coil that I don't see on the parts pictorial (perhaps a sensor?) and another that might be the suction pipe/capillary tube 49-1942, that he thought might be the next issue I would face.

[Econo Appliance]

What kind of icing were you having, where was the ice?  

[Fritz]

it was clear ice on the evap coil and frost on the panel over it.

But the patient dies on the table.  Bought a new fridge, unfortunately, as it turned out a leak "developed".

Not worth further $ on an 18yo, as much as I would have liked to.

It was a Therma badge but built by Whirlpool.  Good beast for a long time.

Bought another Whirly though not quite as beastly.