OK, after your updates, I was able to run the code without errors. You can avoid the renumbering of bins (which are identical in the documentation example but not in your situation because the techs have different skills) by replacing the statements after the solve with the following:
num bin {JOBS};
for {j in JOBS} do;
for {t in TECHS_j[j]: Assign[j,t].sol > 0.5} do;
bin[j] = t;
leave;
end;
end;
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