I'm so sorry to hear this happen. I have 2 Jobos that have been unused since I started the emulsion work, but I too am concerned about longevity. I cannot help you, but I do believe that there will come a point when all of the parts are used up in exchanges. They wear and are one of a kind designed just for the Jobo. Heating elements and gears are big problems. Motors are special order items as well, I understand. And, they tend to burn out due to strain imposed by heavy loads in the drums.
Is this the fate of all automated analog cameras as well? It seems to me, we will see an epidemic of this across the board as the equipment becomes older and older.
Best wishes to you all for some sort of solution to the problem.