I have a reflow station as well and the degree in electronics from Purdue to understand what happening. As I'm more interested in building my reputation, I will check them out for free until  1/1/18( not including shipping, limit five per customer). If I can find the problem and repair it that's free too( have the parts, free to send two get one 100% working. I will even start posting my repairs to YouTube(like my hero ipad rehab, lol). As a newbie I am only allowed to PMs, please text me at 219.525.7771

I have heard about this chain of people speaking of and I just don't see how it can exist functionally .If the chain is as one described like a ladder then one going out will not affect the voltage of any others, as the voltage drop in a parallel circuit is equal regardless of the number of elements if it is in fact a like a steel chain then the first time one goes out they should all instantly stop working. So I'm very look interested to look into this.
Thanks,
J