Well, thanks for the response. I didn't think it would be easy... Oh well...
One thing that I noticed is that there is a little toner left in the imaging unit after the cartridge is empty. When the imaging unit is depleted or fails, you can put the leftover toner back in the toner cartridge by leaving the cartridge on the imaging unit with the lever still locked in, remove the imaging unit with the toner cartidge, turning the whole think upside down and then tap on the assembly. Do it outside, because some toner will escape.
But that's about it.
There may be other tricks that may help and I'll post them when I find them out.
Thanks again.