CJ you can reset the drum life counter with minifuse, I can post a illustration on how to do so. It is 0.125A tiny fuse, some sell the on Ebay for 20 times the cost but they could be found on internet dirty cheap. On other hand if drum gives you quality issues - it is done. We had made a few attempts to dis-assemble them - mission impossible. What is interesting is that drums from all Phaser 7400, Oki ES-3640, Oki C9800 series could be used in any machine. There are tiny pins on the back that make all the difference. The pin fits in to plastic housing on the back wall of the printer. Remove the housing and machine is ready to accept any drum there are but a person doing this should take extra caution not to confuse the drums in between it's positions. Also toner pins where the cartridge fits that OKi, xante, xerox configure to their own combination, just completely remove them with pliers and Drum unit is ready to accept any toner cartridge.
I must add that last will allow the person to install cyan on place of magenta or mix them up in any combination so please be careful - Cyan toner goes on top of cyan drum, magenta toner on Magenta drum, Yellow on yellow and black toner must be installed to black drum.