Ok got the UCA's off last night. The more rear bolts on both were very rusted but but came free without any drama. The forward bolts were easy to remove and had much less rust. I doubt they put a torque wrench on them but I also wouldn't say they were way over torqued. (Spec is 59#) All joint were able to be removed by hand without any tools and had reasonably good movement. I doubt they weren't greased at all, however they weren't greased how I would have done it. (As was said earlier if they weren't greased they woulda squeaked like crazy.)In their defense the packet of grease that came with them was relatively small. Let's remember these were on for 3 years, this wasn't an install the bushings and instant snap scenario.
From the looks of the snapped area of the arms it appears one snapped then the other gave at a later time. The arms themselves do not appear to have been in contact with anything causing them to snap. I'm not experienced with welds so I'll let someone else analyze that but the ends of both appear pretty flat to me, so maybe the weld gave? I think the idea that the installer over heated the arms removing the old bushings is at least a strong contributing factor if not the sole reason.

I attached pictures as well

Attached Images