Truth be told, I don't think the company nor an aftermarket supplier will put in the effort anymore. I really couldn't say I feel Oreck is now a brand to be sought. 20 years ago, yes, but many other companies like Riccar have "built a better mousetrap" and built a more heavy duty 8 pound upright. For all we know, TTI may in time drop Oreck (like they did with Royal).
I can tell you Oreck had a run of defective fan housings in late 2001/early 2002. Most if not all have been replaced by this point.