The module in question is one that runs but has a misfire. I thought about the oven thing. I'd seen that thread, too.....but in my mind, the thing runs on the engine at at least 130 degrees, all the time....so I never really bought into that idea, myself. To each his own, though! And oh yes, I have been looking on eBay. I did get one used one; but it was the ONLY one. (I haven't tried it to see if it works yet!) There are NO new replacements, whereas other models, there is tons of new stuff available.
As for the D-series pistons, I will look again...I must be using the wrong search words?